CN106440555A - Multi-split system and control method thereof - Google Patents
Multi-split system and control method thereof Download PDFInfo
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- CN106440555A CN106440555A CN201610882917.8A CN201610882917A CN106440555A CN 106440555 A CN106440555 A CN 106440555A CN 201610882917 A CN201610882917 A CN 201610882917A CN 106440555 A CN106440555 A CN 106440555A
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- Prior art keywords
- port
- heat exchanger
- cross valve
- valve
- indoor heat
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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
- 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
- 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
- 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
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a multi-split system. The multi-split system comprises a compressor, a first four-way valve, a second four-way valve, a first outdoor heat exchanger, a second outdoor heat exchanger and an indoor heat exchanger. An exhaust port of the compressor communicates with a first port of the first four-way valve and a first port of the second four-way valve, and an air returning port communicates with a third port of the first four-way valve and a third port of the second four-way valve. A second port of the first four-way valve communicates with one end of the first outdoor heat exchanger, and the other end of the first outdoor heat exchanger communicates with one end of the indoor heat exchanger through a first throttle part. A second port of the second four-way valve communicates with one end of the second outdoor heat exchanger, and the other end of the second outdoor heat exchanger communicates with one end of the indoor heat exchanger through a second throttle part. The other end of the indoor heat exchanger communicates with a fourth port of the first four-way valve and a fourth port of the second four-way valve. The position of the fourth port of the second four-way valve is further connected with a switching valve. The invention further discloses a control method for the multi-split system. By means of the multi-split system and the control method for the multi-split system, the user using comfort and the system running reliability are improved.
Description
Technical field
The present invention relates to field of air conditioning, particularly to a kind of multiple on-line system and its control method.
Background technology
For multiple on-line system, generally use frequency-changeable compressor, but frequency-changeable compressor has a minimum operating frequency, when
When system is in low temperature Smaller load refrigeration, even if compressor operating low-limit frequency, for huge discharge compressor, ability exports
Or bigger than normal, the temperature that will result in indoor heat exchanger is too low and cause indoor set to freeze.
In order to prevent indoor set from freezing, existing way is to increase the protection of indoor set anti-freeze, that is, when evaporating temperature is too low
When, stop outer machine, make outer machine be in holding state, when the temperature of indoor heat exchanger raises, restart outer machine.But this way
Outer machine frequent start-stop can be caused, have a strong impact on user's comfort, cause system oil drain quantity to increase, oil return is difficult, shadow simultaneously
Acoustic system reliability.
Content of the invention
The main object of the present invention is to propose a kind of multiple on-line system and its control method it is intended to make multiple on-line system exist
Prevent indoor set from freezing in the case of non-stop-machine, improve user's comfort and system operation reliability.
For achieving the above object, a kind of multiple on-line system proposed by the present invention, including compressor, the first cross valve, second
Cross valve, the first outdoor heat exchanger, the second outdoor heat exchanger, first throttle part, the second throttle part, indoor heat exchanger；
The exhaust outlet of described compressor is connected with the first port of the first cross valve and the second cross valve respectively, described compression
The gas returning port of machine is connected with the 3rd port of the first cross valve and the second cross valve；
The second port of described first cross valve is connected with described first outdoor heat exchanger one end, the first outdoor heat exchanger
The other end is connected with indoor heat exchanger one end through first throttle part, and the 4th of the other end of indoor heat exchanger and the first cross valve the
Port connects；
The second port of described second cross valve is connected with described second outdoor heat exchanger one end, the second outdoor heat exchanger
The other end is connected with indoor heat exchanger one end through the second throttle part, and the 4th of the other end of indoor heat exchanger and the second cross valve the
Port connects；
4th port of described second cross valve is also associated with switch valve.
Preferably, described switch valve is check valve.
Preferably, described indoor heat exchanger includes at least two indoor heat exchange units being arranged in parallel.
Preferably, one end that described interior heat exchange unit is connected with outdoor heat exchanger is additionally provided with electric expansion valve.
Preferably, described first throttle part and the connecting pipeline of indoor heat exchanger are provided with high pressure valve；Described second section
Stream unit is provided with low pressure valve with the connecting pipeline of indoor heat exchanger.
Preferably, described multiple on-line system also includes control panel, and described control panel according to the operating load of system, controls the
The port conducting of one cross valve and the second cross valve.
Additionally, for achieving the above object, the embodiment of the present invention additionally provides a kind of control method of multiple on-line system, including
Following steps：
During multiple on-line system is run, judge whether system is in underrun state；
When system is in underrun state, control first port and the second port conducting of the first cross valve, the
3rd port of one cross valve and the conducting of the 4th port；And control the first port of the second cross valve and the 4th port to turn on,
The second port of the second cross valve and the conducting of the 3rd port.
Preferably, during described multiple on-line system is run, judge whether system is in the step of underrun state and includes：
During multiple on-line system is run, judge whether the temperature of indoor heat exchanger is less than default temperature threshold；
When the temperature of indoor heat exchanger is less than default temperature threshold, compressor frequency reducing is controlled to run；
When compressor is downconverted to default frequency threshold, the temperature of indoor heat exchanger is still less than default temperature threshold
When, judgement system is in underrun state；Otherwise judge that system is not at underrun state.
Preferably, described control method also includes：
When system is not at underrun state, control first port and the second port conducting of the first cross valve,
3rd port of the first cross valve and the conducting of the 4th port；And control the first port of the second cross valve and second port to lead
Lead to, the 3rd port of the second cross valve and the 4th port turn on.
Preferably, if the switch valve that the 4th port of described second cross valve connects is magnetic valve, the control of multi-connected machine
Method also includes：
When system is in underrun state, control closed electromagnetic valve；
When system is not at underrun state, magnetic valve is controlled to open.
The embodiment of the present invention is by the structure design of above-mentioned multiple on-line system so that this multiple on-line system can meet low bearing
The operation demand of lotus is it is also possible to meet normal operation demand.And, when multiple on-line system runs underload, can be by the
The port conducting setting of one cross valve and the second cross valve, and make so that the second outdoor heat exchanger makes as indoor heat exchanger
With bypassing a part of refrigerant, thus preventing indoor set from freezing in the case of non-stop-machine, improve user's comfort and being
System operational reliability.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the structural representation of multiple on-line system one embodiment of the present invention；
Fig. 2 is the schematic flow sheet of control method one embodiment of multiple on-line system of the present invention；
For in the control method of multiple on-line system of the present invention, Fig. 3 judges whether system is in the refinement of underrun state
Step schematic diagram；
Fig. 4 is the refrigerant of multiple on-line system when running underrun state in the control method of multiple on-line system of the present invention
Loop direction schematic diagram；
The schematic flow sheet of control method one embodiment that Fig. 5 is multiple on-line system of the present invention for Fig. 2；
Fig. 6 be multiple on-line system of the present invention control method in when running non-underrun state multiple on-line system cold
Matchmaker's loop direction schematic diagram.
Drawing reference numeral explanation：
The realization of the object of the invention, functional characteristics and advantage will be described further in conjunction with the embodiments referring to the drawings.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of not making creative work all its
His embodiment, broadly falls into the scope of protection of the invention.
If it is to be appreciated that relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention,
Then directionality instruction be only used for explain under a certain particular pose (as shown in drawings) relative position relation between each part,
Motion conditions etc., if this particular pose changes, directionality instruction also correspondingly changes therewith.
If in addition, relating to the description of " first ", " second " etc. in the embodiment of the present invention, should " first ", " second " etc.
Description be only used for describing purpose, and it is not intended that instruction or imply its relative importance or implicit indicate indicated skill
The quantity of art feature.Thus, define " first ", the feature of " second " can be expressed or implicitly include at least one this spy
Levy.In addition, the technical scheme between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
Based on enough realizations, will be understood that the knot of this technical scheme when the combination appearance of technical scheme is conflicting or cannot realize
Close and do not exist, also not within the protection domain of application claims.
The invention provides a kind of multiple on-line system, when running for system Smaller load, control the conducting of refrigerant pipeline, make
Part outdoor heat exchanger uses as indoor heat exchanger, such that it is able to bypass a part of refrigerant, the partial capability of unloading compressor
Output, prevents indoor set from freezing in the case of non-stop-machine.
Specifically, as shown in figure 1, showing the structure of multiple on-line system one embodiment of the present invention.This multiple on-line system bag
Include compressor 1, the first cross valve 2, the second cross valve 3, the first outdoor heat exchanger 4, the second outdoor heat exchanger 6, first throttle portion
Part 8, the second throttle part 9, indoor heat exchanger.Wherein indoor heat exchanger may include multiple interiors heat exchange unit, such as shown in Fig. 1
The first indoor heat exchange unit 14a, the second indoor heat exchange unit 14b.
Above-mentioned first cross valve 2 and the second cross valve 3 are respectively provided with four ports, that is, first port a, second port b, the 3rd
Port c, the 4th port d.
The exhaust outlet of compressor 1 passes through refrigerant pipeline first port a and the second cross valve 3 with the first cross valve 2 respectively
First port a connection.The gas returning port of compressor 1 passes through refrigerant pipeline the 3rd port c and second with the first cross valve 2 respectively
3rd port c connection of cross valve 3.It is understood that this multiple on-line system may also include a gas-liquid separator 11, will return
The refrigerant of back pressure contracting 1 carries out gas-liquid separation, it is to avoid the refrigerant of liquid enters compressor 1.3rd port c of the first cross valve 2 with
After 3rd port c of the second cross valve 3 is converged by refrigerant pipeline, connect with the entrance of gas-liquid separator 11, gas-liquid separator
11 outlet is connected with the gas returning port of compressor 1 by refrigerant pipeline again.
One end of first outdoor heat exchanger 4 is connected with second port b of the first cross valve 2 by refrigerant pipeline, the first Room
External heat exchanger 4 other end is connected with one end of first throttle part 8 by refrigerant pipeline.One end of second outdoor heat exchanger 6 leads to
Second port b crossing refrigerant pipeline with the second cross valve 3 connects, the other end of the second outdoor heat exchanger 6 pass through refrigerant pipeline with
One end connection of the second throttle part 9.The other end of the other end of first throttle part 8 and the second throttle part 9 passes through refrigerant
After pipeline converges, then connect with indoor heat exchanger one end.I.e. one end of heat exchange unit 14a indoor with first and second Room respectively
One end connection of interior heat exchange unit 14b.
The indoor heat exchanger other end passes through refrigerant pipeline the 4th port d and the second four-way with the first cross valve 2 respectively
4th port d connection of valve 3.I.e. the other end of the first indoor heat exchange unit 14a and the second indoor heat exchange unit 14b's is another
End converged by refrigerant pipeline after, more respectively with the 4th port d of the first cross valve 2 and the 4th port d of the second cross valve 3
Connection.
It is additionally provided with switch valve 13 at 4th port d of above-mentioned first cross valve 2.This switch valve 13 can be electrically-controlled valve, example
As magnetic valve.Certainly, this switch valve 13 can also be check valve, do not need automatically controlled just to reach corresponding function.
Further, the exhaust ports of above-mentioned compressor 1 are provided with check valve 12, to prevent refrigerant adverse current.
Above-mentioned first throttle part 8 is connected with one end of indoor heat exchanger with the refrigerant meet of the second throttle part 9
Refrigerant pipeline is provided with high pressure valve 16.And, when indoor heat exchange unit has multiple, each indoor heat exchange unit is with high pressure valve even
It is additionally provided with electric expansion valve on the refrigerant pipeline connecing.For example, in Fig. 1, the first indoor heat exchange unit 14a is connected with high pressure valve 16
Refrigerant pipeline is provided with the first electric expansion valve 15a, on the refrigerant pipeline that the second indoor heat exchange unit 14b is connected with high pressure valve 16
It is provided with the second electric expansion valve 15b.
The refrigerant pipeline that the above-mentioned indoor heat exchanger other end is connected with the first cross valve 2 and the second cross valve 3 is provided with low
Pressure valve.
Further, above-mentioned multiple on-line system also includes control panel, and this control panel is used for the operating load according to system, control
Make the port conducting of the first cross valve and the second cross valve.For example, the first cross valve and the second cross valve are respectively provided with off-position
And power-up state.That is, during the first cross valve 2 off-position, first port a and second port b communicate, the 3rd port c and the 4th
Port d communicates；During power-up state, first port a and the 4th port d communicate, and second port b and the 3rd port c communicate.Two or four
During port valve 3 off-position, first port a and the 4th port d communicate, and second port b and the 3rd port c communicate；During power-up state
Single port a and second port b communicate, and the 3rd port c and the 4th port d communicate.Therefore, this control panel can control the first four-way
On valve 2 and the second cross valve 3, electricity or power-off, to control the refrigerant circulation path of multiple on-line system, meet the operation demand of system.
If it should be noted that above-mentioned switch valve be electrically-controlled valve, this control panel be additionally operable to control electrically-controlled valve unlatching or
Close.
In addition, in above-mentioned multiple on-line system embodiment, only listing a preferred embodiment of the present invention, by other changes
The multiple on-line system of shape structure is also within the scope of the present invention.For example, switch valve is arranged on the 4th end of the first cross valve 2
At mouth d.Or it is respectively provided with switch valve at the 4th port d of the first cross valve 2 and at the 4th port d of the second cross valve 3,
According to system operation demand, and to select the first outdoor heat exchanger 4 or the second outdoor heat exchanger 6 to make as indoor heat exchanger
With, or only using the first outdoor heat exchanger 4 or the second outdoor heat exchanger 6.
The embodiment of the present invention is by the structure design of above-mentioned multiple on-line system so that this multiple on-line system can meet low bearing
The operation demand of lotus is it is also possible to meet normal operation demand.And, when multiple on-line system runs underload, can be by the
The port conducting setting of one cross valve 2 and the second cross valve 3, and make so that the second outdoor heat exchanger makes as indoor heat exchanger
With bypassing a part of refrigerant, thus preventing indoor set from freezing in the case of non-stop-machine, improve user's comfort and being
System operational reliability.
Accordingly, the invention allows for a kind of control method of multiple on-line system.As shown in Fig. 2 this multiple on-line system
Control method comprise the following steps：
During step S110, multiple on-line system are run, judge whether system is in underrun state；
In one embodiment, in multiple on-line system unlatching or running, obtain the energy requirement of system, and according to this energy
Amount demand, judges whether system is in underrun state.Specifically, when multiple on-line system is run, the interior chance of unlatching will
Energy requirement sends and is collected to outer machine, the energy requirement that outer machine sends according to each interior machine, and by this energy requirement and presets
Demand threshold be compared, when energy requirement be less than default demand threshold when, then judge that system is in underrun shape
State, otherwise judges that system is not at underrun state.
In another embodiment, as shown in figure 3, this step S110 specifically includes：
During step S111, multiple on-line system are run, judge whether the temperature of indoor heat exchanger is less than default temperature threshold；
In the present embodiment, this default temperature threshold for 0 DEG C it is of course possible to arrange other values as the case may be, example
As -1 DEG C.When multiple on-line system refrigerating operaton, the temperature of this indoor heat exchanger refers to the coil temperature of heat exchanger.Work as multi-connected machine
During system heating operation, the temperature of this indoor heat exchanger refers to the outlet temperature of heat exchanger.The temperature of this indoor heat exchanger can be led to
Cross the temperature sensor detection being disposed in the interior on heat exchanger to obtain.
Step S112, when indoor heat exchanger temperature be less than default temperature threshold when, control compressor frequency reducing run；
Step S113, when compressor is downconverted to default frequency threshold, the temperature of indoor heat exchanger is still less than default
During temperature threshold, judgement system is in underrun state；Otherwise judge that system is not at underrun state.
When the temperature of indoor heat exchanger is less than default temperature threshold, then controls compressor frequency reducing to run, will compress
The current operation frequency of machine deducts default frequency quantity, controls compressor to press the frequency after reducing and runs, and returns execution step
S111.When the temperature of indoor heat exchanger is more than default temperature threshold, circulate execution step S111.
After frequency reducing runs, if the frequency after reducing is less than or equal to default frequency threshold, the temperature of indoor heat exchanger
When degree is still less than default temperature threshold, judgement system is in underrun state.Otherwise judge that system is not at low negative
Lotus running status.
Step S120, when system is in underrun state, control the first port of the first cross valve and the second end
Mouth conducting, the 3rd port of the first cross valve and the conducting of the 4th port；And control the first port and the 4th of the second cross valve
Port turns on, and the second port of the second cross valve and the 3rd port turn on.
When system is in underrun state, in order to prevent indoor set from causing outer machine frequently to open because anti-freeze protects
Stop, in the present embodiment, control the first port of the first cross valve and second port conducting, the 3rd port of the first cross valve and the
Four port conductings；And control the first port of the second cross valve and the conducting of the 4th port, the second port of the second cross valve and
3rd port conducting, so that the second outdoor heat exchanger uses as indoor heat exchanger, bypasses a part of refrigerant, thus not shutting down
In the case of prevent indoor set from freezing, improve user's comfort and system operation reliability.
As shown in figure 4, the high pressure-temperature refrigerant that compressor 1 is discharged is through first port a of the first cross valve 2, the second end
Mouth b enters the first outdoor heat exchanger 4.The refrigerant being gone out by the first outdoor heat exchanger 4 heat exchange Posterior circle is through first throttle part 8
It is divided into two branch roads, a branch road is after high pressure valve 16, then respectively enters the first indoor heat exchange unit 14a and the after reducing pressure by regulating flow
Two indoor heat exchange unit 14b, by the indoor heat exchange unit 14b heat exchange Posterior circle of the first indoor heat exchange unit 14a and second go out cold
4th port d, the 3rd port c through the first cross valve 2 for the matchmaker enters gas-liquid separator 11；Another one branch road is through the second restriction
After part 9 enter second Room external heat exchanger 6, the refrigerant being gone out by the second outdoor heat exchanger 6 recuperated cycle through the second cross valve 3 second
Port b, the 3rd port c enter gas-liquid separator 11.Gaseous coolant after being separated by gas-liquid separator 11 returns to compressor 1, complete
Become kind of refrigeration cycle.In this kind of refrigeration cycle, it is evaporimeter by switching a part of outdoor heat exchanger, the evaporation of indoor set can be improved
Temperature, effectively prevents the phenomenon that indoor set freezes, and solves huge discharge compressor simultaneously and exports excessive asking under Smaller load operation
Topic, it is to avoid system frequent start-stop, improves system reliability.
Further, as shown in figure 5, also including after above-mentioned steps S110：
Step S130, when system is not at underrun state, control the first cross valve first port and second
Port turns on, and the 3rd port of the first cross valve and the 4th port turn on；And control the first port and the of the second cross valve
Two-port netwerk turns on, and the 3rd port of the second cross valve and the 4th port turn on.
When system is not at underrun state, the first outdoor heat exchanger 4 and the second outdoor heat exchanger 6 can be passed through
Operation, realize kind of refrigeration cycle, meet the operation demand of system.
As shown in fig. 6, the high pressure-temperature refrigerant that compressor 1 is discharged is divided into two branch roads, a branch road is through the first four-way
First port a of valve 2, second port b enter the first outdoor heat exchanger 4, and another branch road is through the first end of the second cross valve 3
Mouth a, second port b enter the second outdoor heat exchanger 6.The refrigerant being gone out by the first outdoor heat exchanger 4 heat exchange Posterior circle is through first
The reducing pressure by regulating flow of throttle part 8, the refrigerant being gone out by the second outdoor heat exchanger 6 heat exchange Posterior circle is through the section of the second throttle part 9
Stream step-down.The refrigerant of two branch roads is gathered together, and after high pressure valve 16, then respectively enters the first indoor heat exchange unit 14a and the
Two indoor heat exchange unit 14b, by the indoor heat exchange unit 14b heat exchange Posterior circle of the first indoor heat exchange unit 14a and second go out cold
Matchmaker is divided into two branch roads again.4th port d, the 3rd port c through the first cross valve 2 for the refrigerant of one branch road enters gas-liquid and divides
From device 11；4th port d, the 3rd port c through the second cross valve 3 for the another one branch road enters gas-liquid separator 11.By gas-liquid
Gaseous coolant after separator 11 separates returns to compressor 1, completes kind of refrigeration cycle.
Further, if the switch valve that the 4th port of described second cross valve connects is magnetic valve, when system is in
During underrun state, closed electromagnetic valve also to be controlled, led with first port a and the 4th port d preventing the second cross valve 3
When logical, the refrigerant that compressor 1 is discharged is directly entered indoor heat exchanger through the second cross valve 3；When system is not at underrun
During state, magnetic valve is controlled to open, so that during refrigerating operaton, the refrigerant that indoor heat exchanger recycles can pass through two branch roads
Loop back compressor 1, accelerate circulation rate.
The foregoing is only the preferred embodiments of the present invention, not thereby limit the present invention the scope of the claims, every this
Under the inventive concept of invention, the equivalent structure transformation made using description of the invention and accompanying drawing content, or directly/indirectly use
In the scope of patent protection that other related technical fields are included in the present invention.
Claims (10)
1. a kind of multiple on-line system is it is characterised in that include compressor, the first cross valve, the second cross valve, the first outdoor heat exchange
Device, the second outdoor heat exchanger, first throttle part, the second throttle part, indoor heat exchanger；
The exhaust outlet of described compressor is connected with the first port of the first cross valve and the second cross valve respectively, described compressor
Gas returning port is connected with the 3rd port of the first cross valve and the second cross valve；
The second port of described first cross valve is connected with described first outdoor heat exchanger one end, the first outdoor heat exchanger another
End is connected with indoor heat exchanger one end through first throttle part, the 4th port of the other end of indoor heat exchanger and the first cross valve
Connection；
The second port of described second cross valve is connected with described second outdoor heat exchanger one end, the second outdoor heat exchanger another
End is connected with indoor heat exchanger one end through the second throttle part, the 4th port of the other end of indoor heat exchanger and the second cross valve
Connection；
4th port of described second cross valve is also associated with switch valve.
2. multiple on-line system as claimed in claim 1 is it is characterised in that described switch valve is check valve.
3. multiple on-line system as claimed in claim 2 is it is characterised in that described indoor heat exchanger includes at least two parallel connections sets
The indoor heat exchange unit put.
4. multiple on-line system as claimed in claim 3 is it is characterised in that described interior heat exchange unit is connected with outdoor heat exchanger
One end be additionally provided with electric expansion valve.
5. the multiple on-line system as described in any one of claim 2-4 is it is characterised in that described first throttle part is changed with interior
The connecting pipeline of hot device is provided with high pressure valve；Described second throttle part is provided with low pressure with the connecting pipeline of indoor heat exchanger
Valve.
6. multiple on-line system as claimed in claim 1 or 2 is it is characterised in that described multiple on-line system also includes control panel, institute
State the operating load according to system for the control panel, control the port conducting of the first cross valve and the second cross valve.
7. a kind of control method of multiple on-line system is it is characterised in that comprise the following steps：
During multiple on-line system is run, judge whether system is in underrun state；
When system is in underrun state, the first port of the first cross valve and second port is controlled to turn on, the one or four
3rd port of port valve and the conducting of the 4th port；And control the first port of the second cross valve and the 4th port to turn on, second
The second port of cross valve and the conducting of the 3rd port.
8. multiple on-line system as claimed in claim 7 control method it is characterised in that described multiple on-line system run in,
Judge whether system is in the step of underrun state and includes：
During multiple on-line system is run, judge whether the temperature of indoor heat exchanger is less than default temperature threshold；
When the temperature of indoor heat exchanger is less than default temperature threshold, compressor frequency reducing is controlled to run；
When compressor is downconverted to default frequency threshold, when the temperature of indoor heat exchanger is still less than default temperature threshold, sentence
Disconnected system is in underrun state；Otherwise judge that system is not at underrun state.
9. the control method of multiple on-line system as claimed in claim 7 is it is characterised in that described control method also includes：
When system is not at underrun state, the first port of the first cross valve and second port is controlled to turn on, first
3rd port of cross valve and the conducting of the 4th port；And control the first port of the second cross valve and second port to turn on, the
3rd port of two cross valves and the conducting of the 4th port.
If multiple on-line system as claimed in claim 7 control method it is characterised in that described second cross valve
The switch valve that four ports connect is magnetic valve, then the control method of multi-connected machine also includes：
When system is in underrun state, control closed electromagnetic valve；
When system is not at underrun state, magnetic valve is controlled to open.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610882917.8A CN106440555A (en) | 2016-10-08 | 2016-10-08 | Multi-split system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610882917.8A CN106440555A (en) | 2016-10-08 | 2016-10-08 | Multi-split system and control method thereof |
Publications (1)
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| CN107940796A (en) * | 2017-12-11 | 2018-04-20 | 广东美的暖通设备有限公司 | The startup control method of multi-line system and its outdoor unit |
| CN111059732A (en) * | 2019-12-30 | 2020-04-24 | Tcl空调器(中山)有限公司 | Air conditioner and control method thereof |
| WO2020082742A1 (en) * | 2018-10-22 | 2020-04-30 | 合肥美的暖通设备有限公司 | Oil return control method and device of air conditioning system, storage medium, and air conditioning system |
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Application publication date: 20170222 |