CN106440572A - Uniform oil return air conditioning unit and control method thereof - Google Patents
Uniform oil return air conditioning unit and control method thereof Download PDFInfo
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- CN106440572A CN106440572A CN201610814298.9A CN201610814298A CN106440572A CN 106440572 A CN106440572 A CN 106440572A CN 201610814298 A CN201610814298 A CN 201610814298A CN 106440572 A CN106440572 A CN 106440572A
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000004378 air conditioning Methods 0.000 title abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 51
- 239000003507 refrigerant Substances 0.000 claims abstract description 16
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000000446 fuel Substances 0.000 claims description 28
- 230000009471 action Effects 0.000 claims description 19
- 230000015556 catabolic process Effects 0.000 claims description 18
- 235000003642 hunger Nutrition 0.000 claims description 9
- 230000003134 recirculating effect Effects 0.000 claims description 9
- 230000037351 starvation Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 5
- 230000001603 reducing effect Effects 0.000 claims description 5
- 239000003921 oil Substances 0.000 description 296
- 238000010977 unit operation Methods 0.000 description 14
- 239000010725 compressor oil Substances 0.000 description 12
- 230000007246 mechanism Effects 0.000 description 9
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 210000004055 fourth ventricle Anatomy 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010729 system oil Substances 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- Chemical & Material Sciences (AREA)
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention provides a uniform oil return air conditioning unit and a control method thereof, the uniform oil return air conditioning unit comprises outdoor units (201, 202, 203, 204) and indoor units (301, 302, 303, 304), the outdoor units comprise more than two compressors (101, 102) which are arranged in parallel, air suction pipes (401, 402) of the compressors are converged and connected to an air-liquid separator (5), exhaust pipes (601, 602) are converged and connected to an oil separator (7), each compressor is also provided with oil equalizing holes (801, 802) for discharging internal oil and oil equalizing pipes (901, 902) connected with the holes, and the oil equalizing pipes of the compressors are converged and connected to a refrigerant outlet end (71) of the oil separator (7). The invention can effectively and uniformly distribute the oil in the compressor rich in oil to each compressor and the outdoor unit through the oil equalizing pipe, thereby solving the problems of uneven oil distribution and unbalanced oil level.
Description
Technical field
The invention belongs to air-conditioning technical field is and in particular to a kind of equal oil return air-conditioner set and its control method.
Background technology
Compressor is air-conditioner " heart ", when the compressor is operated, has substantial amounts of friction inside it, for ensureing compressor
Reliability service simultaneously improves the performance of compressor, and lubrication is one of important link, and therefore lubricating oil is essential to compressor
, lubricating oil has lubrication, cooling, sealing etc. to act on to compressor.And the requirement to the lubricating oil amount of having for the compressor, in compressor
Lubricating oil cross at least can lack of lubrication, and then damage compressor.Therefore certain oil reserve is to ensure that compressor reliability service
Fundamental prerequisite, only when oil reserve exceedes the minimum oil mass of its needs, guarantee compressor safe and reliable operation.
Modularization unit in running because of module unit operation and installation situation difference, it is possible that one module oil
Many, the few phenomenon of a module oil, it is also possible to appearance one compressor oil is many, a compressor oil is few for inside modules compressor in parallel
Phenomenon.
The all oily method of existing modular system, all oily using three control, that is, module unit need to be in tracheae in parallel and liquid pipe
Outside also need the oil equalizing pipe for equal oil between module unit in parallel, the increase of module unit oil equalizing pipe, then make unit installation,
Debugging, maintenance are just more loaded down with trivial details, and cost is also higher.And oil return method, substantially using control frequency, lift system refrigerant flow rate
Method, realizes oil return, and oil level between parallel connection compressor difficult to realize, between unit balance is it is also difficult to will retain in system
Oil is taken back in compressor, longtime running, and unit can be made oil starvation, the unbalanced phenomenon of oil level.
Because in modularization air-conditioner set of the prior art, oil mass is distributed inequality, oil level imbalance, oil return time length, is returned
There is the technical problems such as liquid hit phenomenon, research and design therefore of the present invention goes out a kind of equal oil return air-conditioner set and its control during oil
Method.
Content of the invention
Therefore, the technical problem to be solved in the present invention is to overcome presence oil in modularization air-conditioner set of the prior art
The uneven defect of amount distribution, thus provide a kind of equal oil return air-conditioner set and its control method.
The present invention provides a kind of equal oil return air-conditioner set, and it includes off-premises station and indoor set, and described off-premises station includes two
The compressor of more parallel setting, and the air intake duct of each described compressor converges and is connected with gas-liquid separator, blast pipe converges
It is connected with oil eliminator, equal oilhole for discharging its interior oil and coupled is wherein additionally provided with each compressor
Oil equalizing pipe, mutually converges between the oil equalizing pipe of each compressor and connects to the refrigerant exit end of described oil eliminator.
Preferably, after plural described oil equalizing pipe converges, described refrigerant exit end is connected to by all oily house steward, and
It is provided with, on described equal oil house steward, the equal fuel tap controlling this pipeline break-make.
Preferably, each described oil equalizing pipe is provided with and only allows oil to flow to described oil eliminator from described compressor
Check valve.
Preferably, plural described air intake duct converges connection and forms air suction main, and described air suction main is another
End is connected with described gas-liquid separator.
Preferably, described gas-liquid separator is provided with the first return line for deriving its interior oil, described first
The other end of return line is connected to described air suction main, and is provided with this pipeline break-make of control on described first return line
First oil return valve.
Preferably, the oil export end of described oil eliminator is also connected with being provided with the second return line, described second oil return pipe
The other end on road is connected on described air suction main, and is additionally provided with the second oil return valve on described second return line.
Preferably, described compressor is two, the respectively first compressor and the second compressor, and is connected to described the
First air intake duct of one compressor air suction mouth, it is connected to the second air intake duct of described second compressor air suction mouth, and be connected to institute
The downtake pipe stating the first exhaust outlet of compressor, the second exhaust pipe being connected to described second exhaust outlet of compressor, described
One blast pipe converges, with described second exhaust pipe, the entrance point being connected to described oil eliminator.
Preferably, described off-premises station is two or more, and setting parallel with one another；And/or, described indoor set be two with
On, and setting parallel with one another.
The present invention also provides a kind of equal method for controlling oil return of equal oil return air-conditioner set, and it uses aforesaid equal oil return air-conditioning
Unit, is controlled to its equal oil return process.
Preferably, when unit includes equal fuel tap, and when detection judges that arbitrary compressor or off-premises station have oil starvation, beat
Drive described equal fuel tap so that the compressor of rich oil drains into oil in unit through equal fuel tap, through indoor set, gas-liquid separator more again
It is back to each machine set compressor suction side and redistribute.
Preferably, when unit also includes the first oil return valve and the second oil return valve, and detect judge arbitrary compressor or
When the recirculating oil quantity of off-premises station is less than default recirculating oil quantity, open described first oil return valve and described second oil return valve.
Preferably, when all compressors are all turned on, it is not compressed the rotation breakdown action of machine；
When the Partial shrinkage machine in all compressors is opened, it is compressed the rotation breakdown action of machine：The portion that will open
Partial compression machine is opened by its frequency reducing, by not actuated Partial shrinkage machine after running the first preset time t 1, reruns and second presets
After time t2, the Partial shrinkage machine first opened is shut down, and the Partial shrinkage machine opened afterwards runs.
Preferably, the unlatching Capacity Selection according to indoor set opens all or part of compressor.
Preferably, when indoor set unlatching capacity is larger, whole compressors are opened；When indoor set unlatching capacity is less,
Opening section compressor.
Preferably, when described off-premises station is two or more：
When all off-premises stations are all turned on, do not carry out the rotation breakdown action of off-premises station, open equal fuel tap and directly carry out
Oily redistributes；
When the part off-premises station in all off-premises stations is opened, carry out the rotation breakdown action of off-premises station：The single outer machine of execution
Rotation runs or the many outer wheels of execution change operation.
Preferably, the outer wheel of described list changes and operates to：When unit starts for the first time, 1 outer machine starts, and is opened with each
1 outer machine mutually not repeating, its besides machine be turned off, open successively until all outer machine is all opened successively；
Described many outer wheels change and operate to：When unit starts for the first time, m outer machine starts, and wherein 2≤m≤n, n are complete
The number of portion's off-premises station, with open every time the m mutually not repeated an outer machine, its besides machine be turned off, open until all outward successively
Machine is all opened successively.
Preferably, when all indoor sets are all turned on, do not carry out the rotation breakdown action of indoor set, open equal fuel tap straight
Tap into redistributing of row oil；
When the part indoor set in all indoor sets is opened, carry out the rotation breakdown action of indoor set：Open every time not
The a indoor set mutually repeating, remaining indoor set are turned off, and open indoor set until whole indoor sets are all unlocked successively successively
Cross, wherein a is less than the natural number of indoor set sum.
Preferably, keep when opening indoor set in the indoor set that is unlocked electric expansion valve have one and default open
Degree.
A kind of equal oil return air-conditioner set that the present invention provides and its control method have the advantages that：
1. the equal oil return air-conditioner set of the present invention and its control method, discharges its interior oil extremely by arranging on the compressor
The equal oilhole of oil eliminator and oil equalizing pipe, the compressor that can effectively will be enriched in oil derives oil more than needed therein to oil separation
Device refrigerant exit end and then get in machine, finally enter back into off-premises station, compressor returned to by gas-liquid separator with pipeline
Suction side such that it is able to lack oil position (such as indoor set, off-premises station and compressor etc.) provide oil so that
Oil mass is assigned to as much as possible everywhere and is uniformly distributed in each compressor and off-premises station, solves oil mass distribution uneven
Problem；
2. the equal oil return air-conditioner set of the present invention and its control method, discharges its interior oil extremely by arranging on the compressor
The equal oilhole of oil eliminator and oil equalizing pipe, so that oil mass is evenly distributed, can also efficiently solve oil level unbalanced further
Technical problem；
3. the equal oil return air-conditioner set of the present invention and its control method, by the compressor wheels system of changing planes, can solve single pressure
Contracting machine longtime running, oil mass distribution, the problem of oil level balance between unit parallel connection compressor；
4. the equal oil return air-conditioner set of the present invention and its control method, by off-premises station (i.e. set modules) rotation mechanism,
Oil mass distribution between modularization unit, oil level balance can be solved the problems, such as；
5. the equal oil return air-conditioner set of the present invention and its control method, by indoor set rotation mechanism, is grouped, timesharing is opened
Indoor set, the certain aperture of given electronic expansion valve of indoor unit, the oil remaining in indoor set can be drained into rapidly off-premises station again
Distribution, not only can greatly shorten the equal oil return time, keep oil mass distribution equilibrium and oil level balance between modular system unit,
Liquid hit phenomenon during equal oil return for the modular system can also be reduced；
6. the equal oil return air-conditioner set of the present invention and its control method, can extend compressor service life；Realize unit
Oil level balance, the quick oil return of system between oil level balance, modularization unit between parallel connection compressor；The system that substantially reduces all is returned
The oily time, realize air-conditioning system and stablize, safely run.
Brief description
Fig. 1 is the structural representation of the equal oil return air-conditioner set of the present invention；
Fig. 2 is single off-premises station (i.e. single module) internal structure schematic diagram of the equal oil return air-conditioner set of the present invention；
Fig. 3 is the compressor rotation control flow schematic diagram of the equal oil return air-conditioning method of the present invention；
Fig. 4 is set modules (i.e. off-premises station) the rotation control flow schematic diagram of the equal oil return air-conditioning method of the present invention；
Fig. 5 is the indoor set rotation control flow schematic diagram of the equal oil return air-conditioning method of the present invention.
In figure reference is expressed as：
101 first compressors, 102 second compressors, 201 first off-premises stations, 202 second off-premises stations, 203
3rd off-premises station, the outer machine of 204 fourth ventricles, 301 first indoor sets, 302 second indoor sets, 303 the 3rd indoor sets,
30N N indoor set, 401 first air intake ducts, 402 second air intake ducts, 5 gas-liquid separators, 601 downtake pipes,
602 second exhaust pipes, 7 oil eliminators, 71 refrigerant exit ends, 72 oil export ends, 73 entrance points, 801 first
All oilholes, 802 second equal oilholes, 901 first oil equalizing pipes, 902 second oil equalizing pipes, 10 equal oil house stewards, 11 equal oil
Valve, 121 first check valves, 122 second check valves, 13 air suction mains, 14 first return lines, 15 first oil returns
Valve, 16 second return lines, 17 second oil return valves.
Specific embodiment
As Figure 1-5, the present invention provide a kind of equal oil return air-conditioner set, it include off-premises station (the first off-premises station 201,
Second off-premises station 202, the 3rd off-premises station the 203, the 4th 204) and indoor set (the first indoor set 301, the second indoor set the 302, the 3rd
Machine 304 in indoor set 303, fourth ventricle), described off-premises station includes compressor (the first compressor that two or more is arranged in parallel
101st, the second compressor 102), and the air intake duct (the first air intake duct 401, the second air intake duct 402) of each described compressor converges simultaneously
It is connected with gas-liquid separator 5, blast pipe (downtake pipe 601, second exhaust pipe 602) converges and is connected with oil eliminator 7, wherein
Be additionally provided with each compressor equal oilhole (the first equal oilhole 801, the second equal oilhole 802) for discharging its interior oil and
Coupled oil equalizing pipe (the first oil equalizing pipe 901, the second oil equalizing pipe 902), mutually converges between the oil equalizing pipe of each compressor and connects
It is connected to the refrigerant exit end 71 of described oil eliminator 7.
1. the equal oil return air-conditioner set of the present invention, by arranging on the compressor, to discharge its interior oil equal to oil eliminator
Oilhole and oil equalizing pipe, the compressor that can effectively will be enriched in oil derives oil more than needed therein to oil eliminator refrigerant exit
Hold and then get in machine, the suction side finally entering back into off-premises station, returning to compressor by gas-liquid separator with pipeline,
So as to provide oil to the position (such as off-premises station and compressor) lacking oil, so that oil mass is assigned to as much as possible
Everywhere and be uniformly distributed in each compressor and off-premises station, solve the problems, such as that oil mass distribution is uneven；
2. the equal oil return air-conditioner set of the present invention, by arranging on the compressor, to discharge its interior oil equal to oil eliminator
Oilhole and oil equalizing pipe, so that oil mass is evenly distributed, can also efficiently solve the unbalanced technical problem of oil level further.
Preferably, plural described oil equalizing pipe (the preferably first oil equalizing pipe 901, the second oil equalizing pipe 902) converges connection
Pass through all oily house steward 10 afterwards and be connected to described refrigerant exit end, and be provided with this pipeline break-make of control on described equal oil house steward 10
All fuel taps 11.Effectively the oil in plural oil equalizing pipe can be converged and be guided to oil by all oily house steward of setting and separate
The outlet of device and then flow to indoor set, and the oil that flow through in all oily house steward can be played with the work of passage control by equal fuel tap
With.
Preferably, each described oil equalizing pipe (the first oil equalizing pipe 901, the second oil equalizing pipe 902) is provided with and only allows
Oil flows to the check valve of described oil eliminator 7 from described compressor (the first compressor 101, the second compressor 102), and (first is unidirectional
Valve 121 and the second check valve 122).So can effectively ensure that the fluid derived from compressor can successfully flow to room
Interior machine and there is situation about flowing back in the case of preventing compressor side pressure less, effectively prevent oil averaging process can not
Be smoothed out the occurrence of.
Preferably, plural described air intake duct (the first air intake duct 401, the second air intake duct 402) is converged connection and is formed
Air suction main 13, and the other end of described air suction main 13 is connected with described gas-liquid separator 5.Can by arranging air suction main
The air intake duct of the plural compressor being arranged in parallel is confluxed (or claiming to converge), and is connected to gas-liquid separator, thus
The air-flow isolated from gas-liquid separator is enable smoothly and effectively to respectively enter the plural compressor of parallel connection
In.
Preferably, described gas-liquid separator 5 is provided with the first return line 14 for deriving its interior oil, described
The other end of one return line 14 is connected to described air suction main 13, and is provided with this pipe of control on described first return line 14
First oil return valve 15 of road break-make.By the first return line being arranged on gas-liquid separator and making it be connected to air suction main, energy
Enough effectively the oil in gas-liquid separator is derived and be back in compressor, thus further enhancing recirculating oil quantity, improve
Oil return ratio, improves all oily effect, and can be effectively to from gas-liquid by the form arranging the first oil return valve on this pipeline
Carry out the control of break-make via the oil of backflow in this pipeline in separator.
It is further preferred that described first return line is located at the bottom of gas-liquid separator with described gas-liquid separator phase contact
End position, because oil often sinks than cold media gas or even refrigerant liquid, therefore it is often deposited in bottom, so can improve
From gas-liquid separator, the recirculating oil quantity of oil return and oil return efficiency are (compared with the oil flowing back from the top escape pipe of gas-liquid separator
Speech).
Preferably, the oil export end 72 of described oil eliminator 7 is also connected with being provided with the second return line 16, described second time
The other end of oil pipe line 16 is connected on described air suction main 13, and is additionally provided with the second oil return on described second return line 16
Valve 17.By being connected to the second return line of air suction main in the setting of oil export end, can will isolate from oil eliminator
The oil coming is effectively returned to the suction side of compressor, thus more further improving the recirculating oil quantity of compressor, improves back
Oily efficiency and all oily efficiency；On-off effectively can be carried out to the oil flowing through in the second return line by the second oil return valve
Control action.It is further preferred that oil return capillary is additionally provided with this pipeline.
Preferably, described compressor is two, the respectively first compressor 101 and the second compressor 102, and is connected to
First air intake duct 401 of described first compressor air suction mouth, it is connected to the second air intake duct of described second compressor air suction mouth
402, and be connected to the downtake pipe 601 of described first exhaust outlet of compressor, be connected to described second exhaust outlet of compressor
Second exhaust pipe 602, described downtake pipe 601 is converged with described second exhaust pipe 602 and is connected entering to described oil eliminator 7
Mouth end 73.
This be the equal oil return air-conditioner set of the present invention compressor be specially two when preferred constructive form and two
The preferred connected mode of blast pipe.
Preferably, described off-premises station is two or more, and setting parallel with one another；And/or, described indoor set be two with
On, and setting parallel with one another.This be the off-premises station of equal oil return air-conditioner set of the present invention and the preferred number of indoor set and
Connected mode.
The present invention also provides a kind of equal method for controlling oil return of equal oil return air-conditioner set, and it uses aforesaid equal oil return air-conditioning
Unit, is controlled to its equal oil return process.
1. the equal method for controlling oil return of the equal oil return air-conditioner set of the present invention, due to employing aforesaid equal oil return air conditioner
Group, discharges its interior oil to the equal oilhole of oil eliminator and oil equalizing pipe by arranging on the compressor, can effectively will be enriched in
The compressor of oil is derived oil more than needed therein to oil eliminator and then is got in pipeline machine, finally enters back into room
Outer machine, returned to by gas-liquid separator compressor suction side such that it is able to lack oil position (such as off-premises station and pressure
Contracting machine etc.) provide oil, so that oil mass is assigned to as much as possible everywhere and is uniformly distributed to each compressor and outdoor
In machine, solve the problems, such as that oil mass distribution is uneven；
2. the equal method for controlling oil return of the equal oil return air-conditioner set of the present invention, due to employing aforesaid equal oil return air conditioner
Group, discharges its interior oil to the equal oilhole of oil eliminator and oil equalizing pipe so that oil mass is evenly distributed by arranging on the compressor,
The unbalanced technical problem of oil level can also be efficiently solved further.
Preferably, when unit includes equal fuel tap, and when detection judges that arbitrary compressor or off-premises station have oil starvation, beat
Drive described equal fuel tap so that the compressor of rich oil drains into oil in unit through equal fuel tap, through indoor set, gas-liquid separator more again
It is back to each machine set compressor suction side and redistribute.This be the present invention equal method for controlling oil return in include equal fuel tap when unit
When control method, so can effectively make rich in oil compressor be distributed to oil mass lack position, thus having
Realize the balance that oil mass between unit inner compressor is uniformly distributed, reached each compressor chamber oil level to effect.
Preferably, when unit also includes the first oil return valve and the second oil return valve, and detect judge arbitrary compressor or
When the recirculating oil quantity of off-premises station is less than default recirculating oil quantity, open described first oil return valve and described second oil return valve.By also including
First and second oil return valves, and open the means mode of this two oil return valves, can effectively increase and flow back into compressor suction
Oil mass in gas side is thus further increasing oil return efficiency and all oily efficiency.
Preferably, when all compressors are all turned on, it is not compressed the rotation breakdown action of machine；This is pressure of the present invention
Specifically all oily control device when contracting machine is all turned on, is directly entered by opening equal fuel tap even first and second oil return valve
Oily the redistributing of row；
When the Partial shrinkage machine in all compressors is opened, it is compressed the rotation breakdown action of machine：The portion that will open
Partial compression machine is opened by its frequency reducing, by not actuated Partial shrinkage machine after running the first preset time t 1, reruns and second presets
After time t2, the Partial shrinkage machine first opened is shut down, and the Partial shrinkage machine opened afterwards runs.This is that compressor section of the present invention separates
Specifically all oily control device when opening, by the compressor wheels system of changing planes, makes unit each compressor rotation run, can solve single pressure
Contracting machine longtime running, between unit parallel connection compressor, oil mass distribution, the problem of oil level balance, can effectively prevent interior machine from opening and hold
When measuring relatively low, a certain or a few compressor longtime running in unit, effectively extend compressor service life；Realize equal oil return one
Body, realizes oil level balance, the quick oil return of system between oil level balance, modularization unit between unit parallel connection compressor, thus
Realize air-conditioning system to stablize, safely run.
Preferably, the unlatching Capacity Selection according to indoor set opens all or part of compressor.This is the compression of the present invention
Wheel changes the selection gist of the unlatching population size of the compressor in control device, according to the unlatching capacity of indoor set, Neng Gougen
Size according to indoor refrigeration demand is targetedly opened the quantity of compressor, thus be effective to ensure that indoor enough and
Suitable refrigerating capacity and level of comfort.
Preferably, when indoor set unlatching capacity is larger (indoor refrigeration capacity requirement is vigorous), whole compressors are opened；Work as room
Interior machine open capacity less when (indoor refrigeration capacity requirement is less), opening section compressor.This is all oily controlling party of the present invention
The selection of method is opened the concrete of number of compressors and is preferably judged control mode, when indoor set unlatching capacity is larger, room is described
Interior refrigeration capacity requirement is vigorous, then open whole compressors so that refrigerating capacity reaches actual demand, when indoor set opens capacity relatively
Hour indoor refrigeration capacity requirement of explanation is less, then opening section compressor, prevents from now opening number of compressors excessive and make
Indoor temperature is too low and affects comfort level.
Preferably, when described off-premises station is two or more：
When all off-premises stations are all turned on, do not carry out the rotation breakdown action of off-premises station, open equal fuel tap and directly carry out
Oily redistributes；This is specifically all oily control device when compressor of the present invention is all turned on, and directly passes through to open equal fuel tap
Even first and second oil return valves and carry out oil redistribute；
When the part off-premises station in all off-premises stations is opened, carry out the rotation breakdown action of off-premises station：The single outer machine of execution
Rotation runs or the many outer wheels of execution change operation.This is specifically all oily control device when outdoor machine part of the present invention is opened, and leads to
Cross off-premises station rotation mechanism, so that unit each off-premises station (set modules) rotation is run, the outer machine longtime running of single chamber, machine can be solved
Oil mass distribution, the problem of oil level balance between group off-premises station in parallel, when can effectively prevent interior machine unlatching capacity relatively low, in unit
A certain or several off-premises station longtime running, effectively extend off-premises station service life；Realize equal oil return integration, realize unit simultaneously
Oil level balance, the quick oil return of system between oil level balance, modularization unit between connection off-premises station, thus it is steady to realize air-conditioning system
Determine, safely run.
Preferably, the outer wheel of described list changes and operates to：When unit starts for the first time, 1 outer machine starts, and is opened with each
1 outer machine mutually not repeating, its besides machine be turned off, open successively until all outer machine is all opened successively.For example：Ought
When unit starts for the first time, outer machine 1 starts.Outer machine 2, outer machine 3 ... outer machine n shut down.During run time t, outer machine 1 is shut down, the
During restarting, outer machine 2 starts, and outer machine 3, outer machine 4 ... outer machine n, outer machine 1 are shut down.The rest may be inferred carries out set modules rotation
Start.When the unit operation time being more than t, the unit operation time, every t, just carries out module rotation once.This is the present invention
The outer wheel of the operating list of off-premises station rotation changes the concrete control of operation and method of operating opens one so that passing through each
Mode reaches the realization of the effect to equal oil.
Described many outer wheels change and operate to：When unit starts for the first time, m outer machine starts, and wherein 2≤m≤n, n are complete
The number of portion's off-premises station, with open every time the m mutually not repeated an outer machine, its besides machine be turned off, open until all outward successively
Machine is all opened successively.For example：Outer machine 1 and outer machine 2 start, and outer machine 3, outer machine 4 ... outer machine n shut down.Work as compressor emergency shutdown, the
During restarting, outer machine 3, outer machine 4 start, and outer machine 5, outer machine 6 ... outer machine n, outer machine 1, outer machine 2 are shut down.The rest may be inferred is carried out
Set modules rotation starts.This is that the operating many outer wheels of off-premises station rotation of the present invention change concrete control and the operation of operation
Method is so that reach the realization of the effect to equal oil by way of at least two of each unlatching fixation.
Preferably, when all indoor sets are all turned on, do not carry out the rotation breakdown action of indoor set, open equal fuel tap straight
Tap into redistributing of row oil；This is specifically all oily control device when compressor of the present invention is all turned on, and directly passes through to open
All fuel tap even first and second oil return valve and carry out redistributing of oil；
When the part indoor set in all indoor sets is opened, carry out the rotation breakdown action of indoor set：Open every time not
The a indoor set mutually repeating, remaining indoor set are turned off, and open indoor set until whole indoor sets are all unlocked successively successively
Cross, wherein a is less than the natural number of indoor set sum.This is specifically all oily control hand when indoor set part of the present invention is opened
Section, by indoor set rotation mechanism, makes unit each indoor set rotation run, can solve machine longtime running in single chamber, unit is simultaneously
Oil mass distribution, the problem of oil level balance between connection indoor set, when can effectively prevent interior machine unlatching capacity relatively low, a certain in unit
Platform or several indoor set longtime running, effectively extend compressor service life；Realize equal oil return integration, realize unit pressure in parallel
Oil level balance, the quick oil return of system between oil level balance, modularization unit between contracting machine, thus realize air-conditioning system and stablizing, pacifying
Entirely run.
Preferably, keep the electric expansion valve in the indoor set being unlocked to have a default aperture when opening indoor set.
By indoor set rotation mechanism, it is grouped, indoor set is opened in timesharing, the certain aperture of given electronic expansion valve of indoor unit, can will deposit
The oil of machine of staying within drains into rapidly off-premises station and redistributes, and not only can greatly shorten the equal oil return time, keep modularization system
Between system unit, oil mass distribution equilibrium and oil level balance, are also prevented from indoor oil mass and pile up, and outer machine compressor oil starvation reduces
Liquid hit phenomenon during equal oil return for the modular system.
The operation principle of the present invention and preferred embodiment are described below
The invention reside in：
1., by the compressor wheels system of changing planes, single compressor longtime running, oil mass between unit parallel connection compressor can be solved
Distribution, the problem of oil level balance；
2. pass through set modules rotation mechanism, oil mass distribution between modularization unit, oil level balance can be solved the problems, such as；
3. pass through indoor set rotation mechanism, indoor set is opened in packet, timesharing, and given electronic expansion valve of indoor unit is necessarily opened
The oil remaining in indoor set can be drained into rapidly off-premises station and redistribute, not only can greatly shorten the equal oil return time by degree, protects
Hold oil mass distribution equilibrium and oil level balance between modular system unit, modular system can also be reduced during equal oil return
Liquid hit phenomenon.
By above technology, modular system can be made to reach following effect：
1) when can effectively prevent interior machine unlatching capacity relatively low, No. 1 compressor longtime running of unit, make each compressor of unit
Rotation runs, and can not only extend compressor service life；
2) all oil return integrations, realize between unit parallel connection compressor oil level balance between oil level balance, modularization unit,
The quick oil return of system, thus realize air-conditioning system and stablizing, safely running；
3) prevent indoor oil mass from piling up, outer machine compressor oil starvation, reduces system liquid hit phenomenon, and substantially reduces system
All oil return time.
The technical problem solving：
1., by the compressor wheels system of changing planes, single compressor longtime running, oil mass between unit parallel connection compressor can be solved
Distribution, the problem of oil level balance；
2. pass through set modules rotation mechanism, oil mass distribution between modularization unit, oil level balance can be solved the problems, such as；
3. pass through indoor set rotation mechanism, indoor set is opened in packet, timesharing, and given electronic expansion valve of indoor unit is necessarily opened
The oil remaining in indoor set can be drained into rapidly off-premises station and redistribute, not only can greatly shorten the equal oil return time by degree, protects
Hold oil mass distribution equilibrium and oil level balance between modular system unit, modular system can also be reduced during equal oil return
Liquid hit phenomenon.
Beneficial effect：
Due to employing the compressor of the present invention, off-premises station, the rotation formula equal oil return controlling party between each module of indoor set
Method, the present invention was greatly shortened compared with the traditional modular unit equal oil return time, and during the equal oil return of system, can prevent
All during oil return, a large amount of liquid refrigerants are accumulated to vapour liquid separator and cause compressor liquid hammer, by oil extraction and two mistakes of oil return
Journey, makes unnecessary oil in each machine set compressor be redistributed, thus realize oil temperature between compressor, modularization unit putting down
Weighing apparatus, makes system safely and steadly run.
System configuration：
1. this modularization oil-balancing system includes the first compressor 101 with equal oilhole, the second compressor 102 and carries first time
The vapour liquid separator 5 of oil pipe line 14；
2. adopt a kind of high pressure cavity compressor with equal oilhole, equal oilhole 801,802 positioned at compressor operating when required
The top of low oil level；
3. employ a kind of vapour liquid separator 5 with the first return line 14, this first return line 14 is arranged on gas-liquid
The spill port distance below of separator 5 bottom；
4. draw pipeline from the equal oilhole of all parallel connection compressors respectively through check valve 121,122, a road warp after collecting
All fuel taps 11 are to oil eliminator 7 outlet pipe (i.e. at refrigerant exit)；
5. draw pipeline to the air suction main 13 of gas-liquid separator 5 from first return line 14 of gas-liquid separator 5 bottom
Place.
Specific embodiment：
1. compressor rotation controls
1) interior machine unlatching capacity is little, and single compressor runs unit all the time；
After the normal startup of unit, the first compressor 101 first starts, when the unit operation time being equal to t1, the first compressor
101 frequency reducings, the second compressor 102 starts, and when the unit operation continuous working period reaching t1+t2, the first compressor 101 stops
Machine, the second compressor 102 continues to run with, and is designated as a cycle, and time t resets simultaneously.When the unit operation duration again
When reaching t1, the second compressor 102 frequency reducing, the first compressor 101 starts, when the unit continuous working period reaching t1+t2,2
Number compressor shutdown, No. 1 compressor continues to run with；It is designated as second period.And so on circulate.
2) interior machine unlatching capacity is larger, and unit double-compressor runs
After the normal startup of unit, the first compressor 101 first starts, after compressor operating is to certain frequency, No. 2 compressors
Start.When unit operation shutdown is again started up, the compressor shutdown that the last time first starts, another compressor first starts.
Controlled by above compressor rotation, the compressor of rich oil drains into oil in oil eliminator through equal fuel tap, then through room
Interior machine, gas-liquid separator 5 reassign in compressor, realize unit inner compressor oil level balance, can be prevented effectively from machine
Organize the independent longtime running of same compressor or leading startup and oil starvation, the oily phenomenon hit occur, be conducive to system to pacify, stably
Run.
2. set modules rotation controls
1) single module unit operation
When unit starts for the first time, outer machine 1 starts.Outer machine 2, outer machine 3 ... outer machine n shut down.During run time t, outward
Machine 1 is shut down, and when starting for second, outer machine 2 starts, and outer machine 3, outer machine 4 ... outer machine n, outer machine 1 are shut down.The rest may be inferred carries out machine
Group module rotation starts.
When the unit operation time being more than t, the unit operation time, every t, just carries out module rotation once.
2) multimode unit operation
Assume n (n>2) 2 unit operations in platform unit.When unit starts for the first time, outer machine 1 and outer machine 2 start, outward
Machine 3, outer machine 4 ... outer machine n shut down.Work as compressor emergency shutdown, when starting for second, outer machine 3, outer machine 4 start, outer machine 5, outer machine
6 ... outer machine n, outer machine 1, outer machine 2 are shut down.The rest may be inferred carries out set modules rotation startup.
When the unit operation time being more than t, the unit operation time, every t, just carries out module rotation once.
By above set modules rotation control so that the unnecessary oil of each machine set compressor is through equal fuel tap in modular system
Drain in system, then reassign to each unit through indoor set, gas-liquid separator 5 and put down so that realizing oil level between each unit
Weighing apparatus.The same independent longtime running of unit or leading startup can be prevented effectively from whole air-conditioning system and oil starvation etc. occurs therefore
Barrier, is conducive to system safely and steadly to run.
3. between indoor set, rotation controls
When the equal oil return of unit multimode runs, open equal fuel tap, oil return valve 1, oil return valve 2, the compressor of rich oil will exceed
The oil in compressor oil equalization hole drains into indoor set from compressor oil equalization hole through equal fuel tap, through evaporation process, passes through four by indoor set
Port valve is back in vapour liquid separator 3, returns to the oil of vapour liquid separator, on the one hand flows to vapour liquid separator by the spill port of itself
Outlet pipe at, on the one hand pass through the oil return pipe that carries and be immediately discharged at the outlet pipe of vapour liquid separator through oil return valve 2, then by compression
The vapour liquid separator that machine carries is back to the suction side of compressor, returns in the middle of compressor, so that all operations of modular system
Compressor in the compressor oil level of rich oil decline, the compressor oil level of oil starvation rises, until modular system is all runs compression
The oil level of machine reaches balance.
In addition, during the equal oil return of system, if indoor set does not fully open, not opening indoor set every time t1,
Open a platform every time, and do not open the electric expansion valve of indoor set and will give certain aperture, on the one hand ensure not opening in indoor set
Will not there be substantial amounts of oil；On the other hand, it is stopped status due to do not open indoor wheel changing blower fan during unlatching, refrigerant flows through room
Do not carry out heat exchange during interior heat exchanger, substantial amounts of liquid refrigerants of same time both can have been avoided to flow to room so indoor set rotation is opened
Outer machine, makes compressor liquid hammer, the oil do not opened in indoor set can be taken back off-premises station again, is reassigned to each unit, accelerates
The equal oil return of system, makes each machine set compressor oil level reach balance.
Those skilled in the art is it is easily understood that on the premise of not conflicting, above-mentioned each advantageous manner can be free
Ground combination, superposition.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.With
Described in upper be only the preferred embodiment of the present invention it is noted that for those skilled in the art, not
On the premise of departing from the technology of the present invention principle, some improvement and modification can also be made, these improve and modification also should be regarded as this
The protection domain of invention.
Claims (18)
1. a kind of equal oil return air-conditioner set it is characterised in that：Including off-premises station (201,202,203,204) and indoor set (301,
302nd, 303,304), described off-premises station includes the compressor (101,102) that two or more is arranged in parallel, and each described compressor
Air intake duct (401,402) converges and is connected to gas-liquid separator (5), blast pipe (601,602) converges and is connected to oil eliminator (7), its
In each compressor be additionally provided with equal oilhole (801,802) and the oil equalizing pipe being connected with this hole for discharging its interior oil
(901,902), the oil equalizing pipe phase of each compressor is converged and is connected to the refrigerant exit end (71) of described oil eliminator (7).
2. equal oil return air-conditioner set according to claim 1 it is characterised in that：Plural described oil equalizing pipe (901,
902) pass through all oily house steward (10) after converging connection and be connected to described refrigerant exit end, and be provided with described equal oil house steward (10)
Control the equal fuel tap (11) of this pipeline break-make.
3. the equal oil return air-conditioner set according to one of claim 1-2 it is characterised in that：In each described oil equalizing pipe
It is provided with (901,902) and only allow oil to flow to the check valve of described oil eliminator (7) from described compressor (101,102)
(121、122).
4. the equal oil return air-conditioner set according to one of claim 1-3 it is characterised in that：Plural described air intake duct
(401,402) are converged connection and are formed air suction main (13), and the other end of described air suction main (13) and described gas-liquid separator
(5) it is connected.
5. equal oil return air-conditioner set according to claim 4 it is characterised in that：It is provided with described gas-liquid separator (5)
For deriving first return line (14) of its interior oil, it is total that the other end of described first return line (14) is connected to described air-breathing
Pipe (13), and the first oil return valve (15) controlling this pipeline break-make is provided with described first return line (14).
6. the equal oil return air-conditioner set according to one of claim 4-5 it is characterised in that：The oil of described oil eliminator (7)
The port of export (72) is also connected with being provided with the second return line (16), and the other end of described second return line (16) is connected to described suction
On gas house steward (13), and it is additionally provided with the second oil return valve (17) on described second return line (16).
7. the equal oil return air-conditioner set according to one of claim 1-6 it is characterised in that：Described compressor is two, point
Not Wei the first compressor (101) and the second compressor (102), and the first air-breathing being connected to described first compressor air suction mouth
Pipe (401), it is connected to second air intake duct (402) of described second compressor air suction mouth, and be connected to described first compressor row
The downtake pipe (601) of gas port, it is connected to the second exhaust pipe (602) of described second exhaust outlet of compressor, described first row
Tracheae (601) is converged with described second exhaust pipe (602) and is connected to the entrance point of described oil eliminator (7) (73).
8. the equal oil return air-conditioner set according to one of claim 1-7 it is characterised in that：Described off-premises station be two with
On, and setting parallel with one another；And/or, described indoor set is two or more, and setting parallel with one another.
9. a kind of equal method for controlling oil return of equal oil return air-conditioner set it is characterised in that：Usage right requires described in one of 1-8
All oil return air-conditioner set, are controlled to its equal oil return process.
10. equal method for controlling oil return according to claim 9 it is characterised in that：When unit includes equal fuel tap, and detect
When judging that arbitrary compressor or off-premises station have oil starvation, open described equal fuel tap so that the compressor of rich oil will through equal fuel tap
Oil drains in unit, is again back to each machine set compressor suction side again through indoor set, gas-liquid separator and redistributes.
11. equal method for controlling oil return according to claim 10 it is characterised in that：When unit also include the first oil return valve and
During the second oil return valve, and when detecting that the recirculating oil quantity judging arbitrary compressor or off-premises station is less than default recirculating oil quantity, open described
First oil return valve and described second oil return valve.
12. equal method for controlling oil return according to one of claim 10-11 it is characterised in that：When all compressors are whole
During unlatching, it is not compressed the rotation breakdown action of machine；
When the Partial shrinkage machine in all compressors is opened, it is compressed the rotation breakdown action of machine：The part pressure that will open
Contracting machine is opened by its frequency reducing, by not actuated Partial shrinkage machine after running the first preset time t 1, and rerun the second Preset Time
After t2, the Partial shrinkage machine first opened is shut down, and the Partial shrinkage machine opened afterwards runs.
13. equal method for controlling oil return according to claim 12 it is characterised in that：Unlatching Capacity Selection according to indoor set
Open all or part of compressor.
14. equal method for controlling oil return according to claim 13 it is characterised in that：When indoor set unlatching capacity is larger,
Open whole compressors；When indoor set unlatching capacity is less, opening section compressor.
15. equal method for controlling oil return according to one of claim 10-14 it is characterised in that：When described off-premises station is two
When individual above：
When all off-premises stations are all turned on, do not carry out the rotation breakdown action of off-premises station, open equal fuel tap and directly carry out oil
Redistribute；
When the part off-premises station in all off-premises stations is opened, carry out the rotation breakdown action of off-premises station：The single outer wheel of execution changes
Run or the many outer wheels of execution change operation.
16. equal method for controlling oil return according to claim 15 it is characterised in that：The outer wheel of described list changes and operates to：When
When unit starts for the first time, 1 outer machine startup, with open every time the 1 outer machine mutually not repeated, its besides machine be turned off, successively
Open until all outer machine is all opened successively；
Described many outer wheels change and operate to：When unit starts for the first time, m outer machine starts, and wherein 2≤m≤n, n are whole rooms
The number of outer machine, with open every time the m mutually not repeated an outer machine, its besides machine be turned off, open equal up to all outer machines successively
It is opened successively.
17. equal method for controlling oil return according to one of claim 10-16 it is characterised in that：When all indoor sets are whole
During unlatching, do not carry out the rotation breakdown action of indoor set, open equal fuel tap and directly carry out redistributing of oil；
When the part indoor set in all indoor sets is opened, carry out the rotation breakdown action of indoor set：Open mutually not overlapping every time
A multiple indoor set, remaining indoor set are turned off, and open indoor set until whole indoor sets are all opened successively successively, its
Middle a is less than the natural number of indoor set sum.
18. equal method for controlling oil return according to claim 17 it is characterised in that：Keep when opening indoor set being unlocked
Indoor set in electric expansion valve there is a default aperture.
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| CN201610814298.9A CN106440572B (en) | 2016-09-09 | 2016-09-09 | Uniform oil return air conditioning unit and control method thereof |
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| CN107599787A (en) * | 2017-07-27 | 2018-01-19 | 上海盈达空调设备股份有限公司 | A kind of oil electricity mixing caravan air-conditioning system |
| CN107990597A (en) * | 2017-10-25 | 2018-05-04 | 珠海格力电器股份有限公司 | Oil return control method and device for refrigeration system |
| CN108800690A (en) * | 2018-06-06 | 2018-11-13 | 青岛海信日立空调***有限公司 | temperature control device and control method |
| CN111059733A (en) * | 2019-12-31 | 2020-04-24 | Tcl空调器(中山)有限公司 | Compressor unit control method and device |
| CN111426040A (en) * | 2020-04-03 | 2020-07-17 | 广东美的暖通设备有限公司 | Air conditioner, operation control method of air conditioner, and readable storage medium |
| CN114526566A (en) * | 2020-11-05 | 2022-05-24 | 珠海格力电器股份有限公司 | Multi-compressor oil return balance structure, control method thereof and air conditioning system |
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