CN109357429A - A heat recovery multi-line cooling and heating switching device, multi-line and control method - Google Patents
A heat recovery multi-line cooling and heating switching device, multi-line and control method Download PDFInfo
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- CN109357429A CN109357429A CN201811110339.1A CN201811110339A CN109357429A CN 109357429 A CN109357429 A CN 109357429A CN 201811110339 A CN201811110339 A CN 201811110339A CN 109357429 A CN109357429 A CN 109357429A
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- 238000001816 cooling Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000010438 heat treatment Methods 0.000 title claims description 10
- 238000011084 recovery Methods 0.000 title claims description 6
- 239000007788 liquid Substances 0.000 claims abstract description 112
- 239000003507 refrigerant Substances 0.000 claims description 56
- 230000008676 import Effects 0.000 abstract description 30
- 238000005057 refrigeration Methods 0.000 abstract description 16
- 239000002826 coolant Substances 0.000 abstract description 3
- 238000004781 supercooling Methods 0.000 description 23
- 230000002159 abnormal effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
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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
-
- 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
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/007—Compression machines, plants or systems with reversible cycle not otherwise provided for three pipes connecting the outdoor side to the indoor side with multiple indoor units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of heat-reclamation multi-compressors cool-warm switching device, multi-connected machine and control methods, one end of multiple high pressure branch of cool-warm switching device and one end of multiple low pressure branch pipes connect one to one, multiple connecting nodes are formed, multiple connecting nodes and the tracheae of multiple indoor units connect one to one；The other end of multiple high pressure branch is connect with high-pressure air pipe；The other end of multiple low pressure branch pipes is connect with low-pressure air pipe；One end of multiple liquid pipes and one end of multiple separating tubes connect one to one, and form multiple connecting nodes, and multiple connecting nodes and the liquid pipe of multiple indoor units connect one to one；The other end of multiple liquid pipes is connect with main liquid tube；Supervisor's import of the other end and subcooler of multiple separating tubes connects, and is provided with throttle structure on the connecting line of cooling branch pipe import and supervisor outlet；Cooling branch outlet connects low-pressure air pipe.The present invention solves the problems, such as that heat-reclamation multi-compressors refrigeration indoor-unit cooling-medium flow noise is big and compact-sized, at low cost.
Description
Technical field
The invention belongs to air-conditioning technical fields, specifically, being to be related to a kind of heat-reclamation multi-compressors cool-warm switching device, more
Online and control method.
Background technique
Heat-reclamation multi-compressors product is by its excellent energy saving and flexible comfortable usage experience, on the market increasingly
By the favor of user, sales volume is increasing year by year.Most of heat-reclamation multi-compressors product is three-tube type, three-tube type on Vehicles Collected from Market
Heat recovery multiplex unit is when interior machine freezes, heats simultaneously, often because the refrigerant degree of supercooling that machine liquid pipe comes out in heating is insufficient,
Cause it to be easy to produce bigger refrigerant flow noise when flowing into refrigeration indoor unit, and in freezing machine there are when high drop,
Refrigerant distribution imbalance between the interior machine of refrigeration is easily caused, keeps machine effect in the refrigeration of part excessively poor.
Summary of the invention
The present invention provides a kind of heat-reclamation multi-compressors cool-warm switching devices, solve heat-reclamation multi-compressors refrigeration indoor unit
The big problem of refrigerant flow noise, and it is compact-sized, at low cost.
It is achieved in order to solve the above technical problems, the present invention adopts the following technical solutions:
A kind of multi-connected machine cool-warm switching device, including main liquid tube, high-pressure air pipe, multiple high pressure branch, low-pressure air pipe, multiple low pressure
Branch pipe, subcooler, multiple liquid pipes, multiple separating tubes；The connection of the high-pressure air pipe of the high-pressure air pipe and outdoor unit, it is described low
The liquid pipe of the connection of the low-pressure air pipe of air pipe and outdoor unit, the main liquid tube and outdoor unit connects；The multiple high pressure branch
One end and one end of multiple low pressure branch pipes connect one to one, and form multiple connecting nodes, multiple connecting node and multiple rooms
The tracheae of interior machine connects one to one；The other end of the multiple high pressure branch is connect with the high-pressure air pipe respectively, each
Valve is provided on high pressure branch；The other end of the multiple low pressure branch pipe is connect with the low-pressure air pipe respectively, each
Valve is also provided on low pressure branch pipe；One end of the multiple branch liquid pipe and one end of multiple separating tubes connect one to one,
Multiple connecting nodes are formed, multiple connecting node and the liquid pipe of multiple indoor units connect one to one；The multiple branch liquid pipe
The other end connect respectively with main liquid tube, be also provided with valve in each liquid pipe；The other end of the multiple separating tube
It is connect respectively with supervisor's import of subcooler, is also provided with valve on each separating tube；The supervisor of the subcooler
Outlet connection main liquid tube；The cooling branch pipe import of the subcooler and the supervisor of subcooler export and connect, and in connecting tube
Road is provided with throttle structure；The cooling branch outlet of the subcooler connects low-pressure air pipe.
Further, the on-off of the valve on switching device master control borad control high pressure branch.
Further, the on-off of the valve on switching device master control borad control low pressure branch pipe.
Further, the valve being arranged in the branch liquid pipe is check valve, and the entrance of the check valve connects main liquid tube,
The liquid pipe of the outlet connection indoor unit of the check valve；Alternatively, the valve being arranged in the branch liquid pipe is electric expansion valve or electricity
Magnet valve, switching device master control borad control the on-off of the valve in branch liquid pipe.
Further, the valve being arranged on the separating tube is check valve, and the entrance of the check valve connects indoor unit
Liquid pipe, the check valve outlet connection subcooler supervisor's import；Alternatively, the valve being arranged on the separating tube is electricity
Sub- expansion valve or solenoid valve, switching device master control borad control the on-off of the valve on separating tube.
Further, the throttle structure is electric expansion valve or heating power expansion valve or the solenoid valve being cascaded
And capillary, switching device master control borad control the operation of throttle structure.
Further, the supervisor exit of the subcooler is provided with temperature sensor.
Based on the design of above-mentioned multi-connected machine cool-warm switching device, the invention also provides a kind of multi-connected machine, including indoor unit,
Multiple outdoor units and the switching device.
Based on the design of above-mentioned multi-connected machine cool-warm switching device, the invention also provides a kind of multi-connected machine cool-warm switching devices
Control method, comprising:
(1) the corresponding saturation temperature CT of outdoor unit high-pressure is obtained；
(2) the temperature TLq in the supervisor exit of subcooler is obtained；
(3) practical degree of supercooling SC=CT-TLq is calculated；
(4) difference △ T=ST-SC of target degree of supercooling ST and practical degree of supercooling are calculated；
(5) throttle structure, and return step (1) are adjusted according to difference △ T.
Further, described that throttle structure is adjusted according to difference △ T, it specifically includes:
If difference △ T > 0, adjusts throttle structure, so that the cooling branch pipe import of subcooler and the supervisor of subcooler go out
Refrigerant flow on the connecting line of mouth reduces；
If difference △ T < 0, adjusts throttle structure, so that the cooling branch pipe import of subcooler and the supervisor of subcooler go out
Refrigerant flow on the connecting line of mouth increases.
Compared with prior art, the advantages and positive effects of the present invention are: heat-reclamation multi-compressors changes in temperature of the invention switch
Device, multi-connected machine and control method, by one subcooler of design and throttle structure, so that the liquid refrigerant in main liquid tube
When liquid refrigerant with preferable degree of supercooling, therefore in main liquid tube flows into each refrigeration indoor unit, refrigerant stream can effectively avoid
Dynamic abnormal sound solves the problems, such as that heat-reclamation multi-compressors refrigeration indoor-unit cooling-medium flow noise is big, also can effectively avoid because in main liquid tube
Liquid refrigerant degree of supercooling is insufficient and shwoot, in turn results in refrigerant between refrigeration indoor unit and distributes unbalanced problem；Moreover,
Due to only devising a subcooler and a throttle structure, so that heat-reclamation multi-compressors cool-warm switching device structure is tighter
It gathers, cost is relatively low, is easily installed.
After a specific embodiment of the invention is read in conjunction with the figure, the other features and advantages of the invention will become more clear
Chu.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one embodiment of heat-reclamation multi-compressors cool-warm switching device proposed by the invention；
Fig. 2 is the structural schematic diagram of another embodiment of heat-reclamation multi-compressors cool-warm switching device proposed by the invention；
Fig. 3 is the flow chart of one embodiment of heat-reclamation multi-compressors cool-warm switching device control method proposed by the invention.
Appended drawing reference:
1, main liquid tube；2, low-pressure air pipe；3, high-pressure air pipe；4, subcooler.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to drawings and examples,
Invention is further described in detail.
The heat-reclamation multi-compressors of the present embodiment, including outdoor unit, multiple indoor units and multi-connected machine cool-warm switching device.
The heat-reclamation multi-compressors cool-warm switching device of the present embodiment mainly includes main liquid tube 1, high-pressure air pipe 3, multiple high pressures
Branch pipe, low-pressure air pipe 2, multiple low pressure branch pipes, subcooler 4, multiple liquid pipes, multiple separating tubes etc., it is shown in Figure 1；It is high
Air pipe 3 is connect with the high-pressure air pipe of outdoor unit, and low-pressure air pipe 2 is connect with the low-pressure air pipe of outdoor unit, main liquid tube 1 and outdoor unit
Liquid pipe connection.
One end of multiple high pressure branch and one end of multiple low pressure branch pipes connect one to one, and form multiple connecting nodes,
Multiple connecting node and the tracheae of multiple indoor units connect one to one.
The other end of multiple high pressure branch is connect with high-pressure air pipe 3 respectively, is provided with valve on each high pressure branch,
For realizing pipeline on-off.
The other end of multiple low pressure branch pipes is connect with low-pressure air pipe 2 respectively, is also provided with valve on each low pressure branch pipe
Door, for realizing pipeline on-off.
One end of multiple liquid pipes and one end of multiple separating tubes connect one to one, and form multiple connecting nodes, this is more
A connecting node and the liquid pipe of multiple indoor units connect one to one.
The other end of multiple liquid pipes is connect with main liquid tube 1 respectively, is also provided with valve in each liquid pipe, is used for
Realize pipeline on-off.
The other end of multiple separating tubes is connect with supervisor's import A of subcooler 4 respectively, is also all provided on each separating tube
It is equipped with valve, for realizing pipeline on-off.
Subcooler 4 includes tank body, has supervisor import A, supervisor outlet B, cooling branch pipe import C, cooling branch on tank body
Pipe exports D；Supervisor import A is connected to supervisor outlet B by supervisor；Cooling branch pipe import C and cooling branch outlet D pass through cooling
Branch pipe connection.Be responsible for import A enter the refrigerant of subcooler 4 with enter through cooling branch pipe import C the refrigerant of subcooler 4 into
Row heat exchange, i.e. supervisor carry out heat exchange with cooling branch pipe.
The supervisor of subcooler 4 exports B connection main liquid tube 1；The cooling branch pipe import C of subcooler 4 and subcooler 4
Supervisor's outlet B connection is set on the connecting line of the supervisor outlet B of the cooling branch pipe import C and subcooler 4 of subcooler 4
It is equipped with throttle structure VSC；The cooling branch outlet D connection low-pressure air pipe 2 of subcooler 4.
Assuming that multi-connected machine includes n indoor unit, be respectively as follows: indoor unit 1, indoor unit 2 ..., indoor unit n-1, indoor unit
N, it is shown in Figure 1.
It is provided with valve VHI1 on the high pressure branch that high-pressure air pipe 3 connects 1 tracheae of indoor unit,
It is provided with valve VLO1 on the low pressure branch pipe that low-pressure air pipe 2 connects 1 tracheae of indoor unit,
It is provided with valve V11 in the branch liquid pipe that main liquid tube 1 connects 1 liquid pipe of indoor unit,
Valve V12 is provided on the separating tube of 1 liquid pipe of supervisor's import A connection indoor unit of subcooler 4.
It is provided with valve VHI2 on the high pressure branch that high-pressure air pipe 3 connects 2 tracheae of indoor unit,
It is provided with valve VLO2 on the low pressure branch pipe that low-pressure air pipe 2 connects 2 tracheae of indoor unit,
It is provided with valve V21 in the branch liquid pipe that main liquid tube 1 connects 2 liquid pipe of indoor unit,
Valve V22 is provided on the separating tube of 2 liquid pipe of supervisor's import A connection indoor unit of subcooler 4.
It is provided with valve VHIn on the high pressure branch that high-pressure air pipe 3 connects indoor unit n tracheae,
It is provided with valve VLOn on the low pressure branch pipe that low-pressure air pipe 2 connects indoor unit n tracheae,
It is provided with valve Vn1 in the branch liquid pipe that main liquid tube 1 connects indoor unit n liquid pipe,
Valve Vn2 is provided on the separating tube of supervisor's import A connection indoor unit n liquid pipe of subcooler 4.
Assuming that 2 heating operation of indoor unit 1 and outdoor unit, indoor unit 3 and indoor unit n refrigerating operaton.
Valve VHI1, the VHI2 being arranged on high pressure branch are opened, and valve VLO1, the VLO2 being arranged on low pressure branch pipe are closed
It closes, valve V11, the V21 being arranged in branch liquid pipe are closed, and valve V12, the V22 being arranged on separating tube are opened.
Valve VHI3, the VHIn being arranged on high pressure branch are closed, and valve VLO3, the VLOn being arranged on low pressure branch pipe are beaten
It opens, valve V31, the Vn1 being arranged in branch liquid pipe are opened, and valve V32, the Vn2 being arranged on separating tube are closed.
The course of work are as follows: refrigeration of the high-temperature high-pressure refrigerant gas to high-pressure air pipe 3, in high-pressure air pipe 3 is discharged in outdoor unit
Agent gas enters the room machine 1, indoor unit 2 through valve VHI1, VHI2 respectively, condensed by heating indoor unit 1, indoor unit 2
Refrigerant liquid flow to the supervisor import A of subcooler 4, into subcooler 4, then through being responsible for through valve V12, V22 respectively
B outflow is exported, the refrigerant liquid of outflow is divided into two-way, flow to main liquid tube 1 all the way, another way is after throttle structure reducing pressure by regulating flow
It is flow to cooling branch pipe import C, into subcooler 4, then through cooling branch outlet D outflow, into low-pressure air pipe 2.Through being responsible for
The refrigerant that import A enters subcooler 4 carries out heat exchange with the refrigerant for entering subcooler 4 through cooling branch pipe import C, through being responsible for
The refrigerant temperature that import A enters subcooler 4 reduces, and the refrigerant temperature for entering subcooler 4 through cooling branch pipe import C increases.
By controlling throttle structure, the refrigerant that the supervisor outlet B outflow of subcooler 4 may be implemented reaches the degree of supercooling of setting, i.e.,
Liquid refrigerant in main liquid tube 1 has preferable degree of supercooling.The liquid refrigerant for coming together in main liquid tube 1 is evenly distributed to each system
In cold indoor unit, a part of liquid refrigerant enters the room machine n through valve Vn1, another part liquid refrigerant through valve V31 into
Enter indoor unit 3, the refrigerant gas after indoor unit 3, indoor unit n evaporation flow to low pressure gas through valve VLO3, VLOn respectively
Pipe 2, then flows back to outdoor unit.
Therefore, the heat-reclamation multi-compressors cool-warm switching device and heat-reclamation multi-compressors of the present embodiment, by designing a mistake
Cooler and throttle structure, so that the liquid refrigerant in main liquid tube 1 has preferable degree of supercooling, therefore the liquid in main liquid tube 1
When state refrigerant flows into each refrigeration indoor unit, it can effectively avoid refrigerant flowing abnormal sound, solve in heat-reclamation multi-compressors cool room
The big problem of machine refrigerant flow noise also can effectively avoid due to the liquid refrigerant degree of supercooling in main liquid tube 1 is insufficient shwoot, in turn
Refrigerant between refrigeration indoor unit is caused to distribute unbalanced problem；Moreover, because only devising a subcooler and a section
Flow structure, so that multi-connected machine cool-warm switching device structure is compact, cost is relatively low, is easily installed.
The heat-reclamation multi-compressors cool-warm switching device of the present embodiment solves the cool room of three pipeline heat recovery multiplex units
Interior machine refrigerant flowing abnormal sound and refrigerant distribute unbalanced problem.
In this embodiment, the valve being arranged on high pressure branch is the energy such as solenoid valve, electric expansion valve, four-way valve, triple valve
Realize the valve class of flow path on-off, switching device master control borad controls the on-off of the valve on high pressure branch.One as the present embodiment
Kind of preferred design, the valve being arranged on high pressure branch is electric expansion valve, and convenient for control, performance is stablized.
In this embodiment, the valve being arranged on low pressure branch pipe is the energy such as solenoid valve, electric expansion valve, four-way valve, triple valve
Realize the valve class of flow path on-off, switching device master control borad controls the on-off of the valve on low pressure branch pipe.One as the present embodiment
Kind of preferred design, the valve being arranged on low pressure branch pipe is electric expansion valve, and convenient for control, performance is stablized.
In this embodiment, the valve being arranged in branch liquid pipe is check valve, and the entrance of check valve connects main liquid tube 1, check valve
Outlet connection indoor unit liquid pipe；Using check valve, without being controlled, using simple.Alternatively, the valve being arranged in branch liquid pipe
Door is solenoid valve, electric expansion valve etc., and switching device master control borad controls the on-off of the valve in branch liquid pipe, convenient for control, performance
Stablize.
In this embodiment, the valve being arranged on separating tube is check valve, and the liquid pipe of the entrance connection indoor unit of check valve is single
To supervisor's import A of the outlet connection subcooler 4 of valve；Using check valve, without being controlled, using simple.Alternatively, liquid separation
The valve being arranged on pipe is solenoid valve, electric expansion valve, and switching device master control borad controls the on-off of the valve on separating tube, is convenient for
Control, performance are stablized.
In this embodiment, throttle structure be electric expansion valve or heating power expansion valve or the solenoid valve being cascaded and
Capillary etc. realizes the device of liquid refrigerant throttling；Structure is simple, it is easy to use, be easily installed；Switching device master control borad control
Throttling control is realized in the operation of throttle structure processed.
In this embodiment, it is exported in the supervisor of subcooler 4 and is provided with temperature sensor at B, be responsible for out in order to detect
The temperature that mouth B goes out.
Assuming that multi-connected machine includes indoor unit 1 and indoor unit 2, shown in Figure 2, the heating of indoor unit 1, indoor unit 2 freeze, control
Valve VHI1 processed is opened, VLO1 is closed, VHI2 is closed, VLO2 is opened；Valve V11, V12, V21, V22 are check valve.
High-temperature high-pressure refrigerant gas is discharged to high-pressure air pipe 3 in outdoor unit, and the refrigerant gas in high-pressure air pipe 3 passes through valve
Door VHI1 enters the room machine 1, is condensed into liquid refrigerant in the indoor unit 1 of heating, flow to supervisor's import by check valve V12
A, into subcooler 4, then through supervisor outlet B outflow, the refrigerant liquid of outflow is divided into two-way, flow to main liquid tube 1 all the way,
Another way flow to cooling branch pipe import C after throttle structure reducing pressure by regulating flow, into subcooler 4, then through cooling branch outlet D
Outflow, into low-pressure air pipe 2.Operative liquid refrigerant in main liquid tube 1 passes through the indoor unit 2 that check valve V21 flows into refrigeration, warp again
The refrigerant gas after indoor unit 2 evaporates is crossed, low-pressure air pipe 2 is flow to through valve VLO2, then flows back to outdoor unit.
Since there are friction loss during along tube runs for refrigerant, then the refrigerant in the pipeline that it is flowed through
Pressure will gradually reduce, so that P4 >=P2 >=P1 >=P3.The inlet pressure of check valve V11, V22 are less than outlet pressure, single
It will be in close state to valve V11, V22, the inlet pressure of check valve V12, V21 are greater than outlet pressure, check valve V12, V21
It will be in circulation status, then subcooler 4 can only be entered by check valve V12 from the liquid refrigerants that 1 liquid pipe of indoor unit flows out,
After throttle structure VSC by opening subcooler 4 realizes suitable degree of supercooling, main liquid tube 1 is imported.
Based on the design of above-mentioned heat-reclamation multi-compressors cool-warm switching device, the invention also provides a kind of heat-reclamation multi-compressors
Cool-warm switching device control method, mainly includes the following steps, shown in Figure 3.
Step S1: the corresponding saturation temperature CT of outdoor unit high-pressure is obtained.
The high-pressure of the exhaust ports of the compressor of outdoor unit is obtained, the corresponding saturation temperature of high-pressure is then obtained
CT。
Step S2: the temperature TLq in the supervisor exit of subcooler is obtained.
Temperature sensor by the way that supervisor exit is arranged in directly acquires temperature TLq.
Step S3: practical degree of supercooling SC=CT-TLq is calculated.
Step S4: difference △ T=ST-SC of target degree of supercooling ST and practical degree of supercooling are calculated.
Target degree of supercooling ST is preset target value, when the refrigerant in main liquid tube reaches target degree of supercooling ST, total liquid
When liquid refrigerant in pipe flows into each refrigeration indoor unit, refrigerant flowing abnormal sound can effectively avoid.
Step S5: throttle structure, and return step S1 are adjusted according to difference △ T.
Throttle structure is adjusted according to difference △ T, until T=0 △.
The heat-reclamation multi-compressors cool-warm switching device control method of the present embodiment, it is corresponding by obtaining outdoor unit high-pressure
Saturation temperature CT；Obtain the temperature TLq in the supervisor exit of subcooler；Calculate practical degree of supercooling SC=CT-TLq；Calculate mesh
Mark difference △ T=ST-SC of degree of supercooling ST and practical degree of supercooling；Throttle structure is adjusted according to difference △ T, until T=0 △；So that
Liquid refrigerant in main liquid tube has preferable degree of supercooling, therefore the liquid refrigerant in main liquid tube flows into each refrigeration indoor unit
When, it can effectively avoid refrigerant flowing abnormal sound, solve the problems, such as that multi-connected machine refrigeration indoor-unit cooling-medium flow noise is big, can also effectively keep away
Exempt from the shwoot due to liquid refrigerant degree of supercooling in main liquid tube is insufficient, in turn result in refrigerant distribution imbalance between refrigeration indoor unit
The problem of.
In the present embodiment, described that throttle structure is adjusted according to difference △ T, it specifically includes:
If difference △ T > 0, adjusts throttle structure, so that the cooling branch pipe import of subcooler and the supervisor of subcooler go out
Refrigerant flow on the connecting line of mouth reduces, and to increase the temperature TLq in supervisor exit, avoids degree of supercooling too low, avoids
Influence the cold medium flux in main liquid tube.
If difference △ T < 0, adjusts throttle structure, so that the cooling branch pipe import of subcooler and the master of subcooler
Refrigerant flow on the connecting line of pipe outlet increases, and to reduce the temperature TLq for increasing supervisor exit, reduces degree of supercooling.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than is limited；Although referring to aforementioned reality
Applying example, invention is explained in detail, for those of ordinary skill in the art, still can be to aforementioned implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these are modified or replace
It changes, the spirit and scope for claimed technical solution of the invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811110339.1A CN109357429A (en) | 2018-09-21 | 2018-09-21 | A heat recovery multi-line cooling and heating switching device, multi-line and control method |
| EP19861762.3A EP3855094A4 (en) | 2018-09-21 | 2019-06-21 | COOLING AND HEATING SWITCHING DEVICE FOR VARIABLE REFRIGERANT FLOW SYSTEM WITH HEAT RECOVERY, VARIABLE REFRIGERANT FLOW SYSTEM AND CONTROL METHOD |
| PCT/CN2019/092372 WO2020057210A1 (en) | 2018-09-21 | 2019-06-21 | Cooling and heating switching device for variable refrigerant flow system capable of heat recovery, variable refrigerant flow system, and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811110339.1A CN109357429A (en) | 2018-09-21 | 2018-09-21 | A heat recovery multi-line cooling and heating switching device, multi-line and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109357429A true CN109357429A (en) | 2019-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811110339.1A Pending CN109357429A (en) | 2018-09-21 | 2018-09-21 | A heat recovery multi-line cooling and heating switching device, multi-line and control method |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3855094A4 (en) |
| CN (1) | CN109357429A (en) |
| WO (1) | WO2020057210A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110360780A (en) * | 2019-07-23 | 2019-10-22 | 珠海格力电器股份有限公司 | Multi-split air conditioning system, supercooling degree determination method, device and equipment thereof and storage medium |
| WO2020057210A1 (en) * | 2018-09-21 | 2020-03-26 | 青岛海尔空调电子有限公司 | Cooling and heating switching device for variable refrigerant flow system capable of heat recovery, variable refrigerant flow system, and control method |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3855094A1 (en) | 2021-07-28 |
| EP3855094A4 (en) | 2021-12-08 |
| WO2020057210A1 (en) | 2020-03-26 |
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