CN106440572B - A kind of equal oil return air-conditioner set and its control method - Google Patents
A kind of equal oil return air-conditioner set and its control method Download PDFInfo
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- CN106440572B CN106440572B CN201610814298.9A CN201610814298A CN106440572B CN 106440572 B CN106440572 B CN 106440572B CN 201610814298 A CN201610814298 A CN 201610814298A CN 106440572 B CN106440572 B CN 106440572B
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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
Abstract
The present invention provides a kind of equal oil return air-conditioner set and the control method with it, the equal oil return air-conditioner set includes outdoor unit (201, 202, 203, and indoor unit (301 204), 302, 303, 304), the outdoor unit includes more than two compressors (101 being arranged in parallel, 102), and the air intake duct (401 of each compressor, 402) converge and be connected to gas-liquid separator (5), exhaust pipe (601, 602) converge and be connected to oil eliminator (7), wherein each compressor is additionally provided with the equal oilhole (801 for its interior oil to be discharged, 802) oil equalizing pipe (901 and with the hole being connected, 902), the oil equalizing pipe of each compressor mutually converges and is connected to the refrigerant exit end (71) of the oil eliminator (7).The oil that can be effectively will be enriched in the compressor of oil through the invention is uniformly distributed in each compressor and outdoor unit by oil equalizing pipe, solves the problems, such as that oil mass distribution is uneven and oil level is unbalanced.
Description
Technical field
The invention belongs to air-conditioning technical fields, and in particular to a kind of equal oil return air-conditioner set and its control method.
Background technique
Compressor is air conditioner " heart ", when the compressor is operated, inside have a large amount of friction, for guarantee compressor
Reliability service and the performance for improving compressor, lubrication is important one of link, therefore lubricating oil is essential to compressor
, lubricating oil has the effects of lubrication, cooling, sealing to compressor.And requirement of the compressor to the lubricating oil amount of having, in compressor
Lubricating oil excessively it is few then can lack of lubrication, and then damage compressor.Therefore certain oil reserve is to guarantee compressor reliability service
Fundamental prerequisite, only when oil reserve be more than its need minimum oil mass, just can guarantee compressor safe and reliable operation.
Modularization unit is in the process of running because of the operation of module unit and installation situation difference, it is possible that a module is oily
It is more, the few phenomenon of a module oil, the compressor of inside modules parallel connection, it is also possible to occur that a compressor oil is more, and a compressor oil is few
The phenomenon that.
The oily method of existing modular system, oily using three control, i.e., module unit need to be in tracheae in parallel and liquid pipe
Except also need it is in parallel for the oil equalizing pipe of oil, the increase of module unit oil equalizing pipe between module unit, then make unit installation,
Debugging, maintenance are just more cumbersome, and cost is also higher.And oil return method, it is basic to use control frequency, lifting system refrigerant flow rate
Method realizes oil return, is difficult to realize between parallel connection compressor, the oil level balance between unit, it is also difficult to by what is retained in system
Oil is taken back in compressor, longtime running, and unit can be made the unbalanced phenomenon of oil starvation, oil level occur.
Since oil mass distribution is uneven, oil level is uneven, the oil return time is long in modularization air-conditioner set in the prior art, returns
There are technical problems such as liquid hit phenomenons during oil, therefore researching and designing of the present invention goes out a kind of equal oil return air-conditioner set and its control
Method.
Summary of the invention
Therefore, there is oil in modularization air-conditioner set in the prior art the technical problem to be solved in the present invention is that overcoming
The uneven defect of amount distribution, to 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 comprising outdoor unit and indoor unit, the outdoor unit include two
The compressor of more parallel setting, and the air intake duct of each compressor converges and is connected with gas-liquid separator, exhaust pipe converges
It is connected with oil eliminator, wherein being additionally provided with equal oilhole for its interior oil to be discharged and coupled on each compressor
Oil equalizing pipe mutually converges and is connected to the refrigerant exit end of the oil eliminator between the oil equalizing pipe of each compressor.
Preferably, the refrigerant exit end is connected to by equal oil general pipeline after more than two oil equalizing pipes converge, and
The equal oil valve for controlling the pipeline on-off is provided on the equal oil general pipeline.
Preferably, being provided on each oil equalizing pipe only allows oil to flow to the oil eliminator from the compressor
Check valve.
Preferably, more than two air intake ducts converge connection and form air-breathing general pipeline, and the air-breathing general pipeline's is another
End is connected with the gas-liquid separator.
Preferably, it is provided with the first oil return line for exporting its interior oil on the gas-liquid separator, described first
The other end of oil return line is connected to the air-breathing general pipeline, and is provided on first oil return line and controls the pipeline on-off
First oil return valve.
Preferably, the oil export end of the oil eliminator, which is also connected with, is provided with the second oil return line, second oil return pipe
The other end on road is connected on the air-breathing general pipeline, and is additionally provided with the second oil return valve on second oil return line.
Preferably, the compressor is two, respectively a first compressor and a second compressor, and is connected to described the
First air intake duct of one compressor air suction mouth, the second air intake duct for being connected to second compressor air suction mouth, and it is connected to institute
The second exhaust pipe stated the downtake pipe of the first exhaust outlet of compressor, be connected to second exhaust outlet of compressor, described
One exhaust pipe and the second exhaust pipe converge the input end for being connected to the oil eliminator.
Preferably, the outdoor unit is more than two, and setting parallel with one another；And/or the indoor unit 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, use equal oil return air-conditioning above-mentioned
Unit controls its equal oil return process.
Preferably, when unit includes equal oil valve, and detection judges that any compressor or outdoor unit there are when oil starvation, are beaten
The equal oil valve is opened, so that the compressor of rich oil drains into oil in unit through equal oil valve, again again through indoor unit, gas-liquid separator
It is back to each machine set compressor suction side and redistributes.
Preferably, when unit further includes the first oil return valve and the second oil return valve, and detection judge any compressor or
When the recirculating oil quantity of outdoor unit is less than default recirculating oil quantity, first oil return valve and second oil return valve are opened.
Preferably, the rotation breakdown action when all compressors are all turned on, without compressor；
When the partial shrinkage machine in all compressors is opened, the rotation breakdown action of compressor is carried out: by the portion of unlatching
Partial compression machine is opened after running the first preset time t 1 by its frequency reducing, by inactive partial shrinkage machine, is reruned second default
After time t2, the partial shrinkage machine first opened is shut down, post-opening partial shrinkage machine operation.
Preferably, all or part of compressor is opened according to the unlatching Capacity Selection of indoor unit.
Preferably, when indoor unit unlatching capacity is larger, whole compressors are opened；When indoor unit unlatching capacity is smaller,
Open partial shrinkage machine.
Preferably, when the outdoor unit is more than two:
When all outdoor units are all turned on, without the rotation breakdown action of outdoor unit, open equal oil valve and directly carry out
Oil is redistributed；
When the part outdoor unit in all outdoor units is opened, the rotation breakdown action of outdoor unit is carried out: executing single outer machine
Rotation operation or the more outer wheels of execution change operation.
Preferably, the outer wheel of the list changes operation are as follows: when unit starts for the first time, 1 outer machine starting, to open every time
Mutually not duplicate 1 outer machine, besides machine is turned off for it, is successively opened until all outer machine is opened successively；
More outer wheels change operation are as follows: when unit starts for the first time, m outer machine startings, wherein 2≤m≤n, n are complete
The number of portion's outdoor unit, mutually not duplicate m outer machines, besides machine is turned off for it to open every time, is successively opened until outside all
Machine is opened successively.
Preferably, when all indoor units are all turned on, without the rotation breakdown action of indoor unit, it is straight to open equal oil valve
Tap into redistributing for row oil；
When the part indoor unit in all indoor units is opened, the rotation breakdown action of indoor unit is carried out: opening every time not
Mutually duplicate a indoor unit, remaining indoor unit are turned off, and successively open indoor unit until whole indoor units are turned on successively
It crosses, wherein a is the natural number less than indoor unit sum.
Preferably, it keeps the electric expansion valve in the indoor unit being turned on to have one to preset when opening indoor unit to open
Degree.
A kind of equal oil return air-conditioner set provided by the invention and its control method have the following beneficial effects:
1. its interior oil is discharged extremely by being arranged on the compressor in equal oil return air-conditioner set of the invention and its control method
The equal oilhole and oil equalizing pipe of oil eliminator, the compressor that can effectively will be enriched in oil, which exports oil more than needed therein to oil, to be separated
Device refrigerant exit end and then as pipeline enters the room machine, finally enters back into outdoor unit, returns to compressor by gas-liquid separator
Suction side, so as to lack oil position (such as indoor unit, outdoor unit and compressor etc.) provide oil so that
Oil mass is assigned to everywhere as much as possible and is uniformly distributed in each compressor and outdoor unit, and it is uneven to solve oil mass distribution
The problem of；
2. its interior oil is discharged extremely by being arranged on the compressor in equal oil return air-conditioner set of the invention and its control method
The equal oilhole and oil equalizing pipe of oil eliminator, so that oil mass is evenly distributed, it is unbalanced further to efficiently solve oil level
Technical problem；
3. equal oil return air-conditioner set of the invention and its control method can solve single pressure by the compressor wheels system of changing planes
Contracting machine longtime running, between unit parallel connection compressor the problem of oil mass distribution, oil level balance；
4. equal oil return air-conditioner set of the invention and its control method, by outdoor unit (i.e. set modules) rotation mechanism,
The problem of can solve oil mass distribution between modularization unit, oil level balance；
5. equal oil return air-conditioner set of the invention and its control method, by indoor unit rotation mechanism, grouping, timesharing are opened
Indoor unit gives the certain aperture of electronic expansion valve of indoor unit, the oil for remaining in indoor unit can be drained into outdoor unit again rapidly
Distribution can not only greatly shorten the equal oil return time, keep oil mass distribution equilibrium and oil level balance between modular system unit,
Liquid hit phenomenon of modular system during equal oil return can also be reduced；
6. equal oil return air-conditioner set of the invention and its control method, are able to extend compressor service life；Realize unit
Oil level balance, oil level balance, the quick oil return of system between modularization unit between parallel connection compressor；System is substantially reduced to return
The oily time realizes that air-conditioning system is stable, safely runs.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of equal oil return air-conditioner set of the invention；
Fig. 2 is single outdoor unit (i.e. single module) schematic diagram of internal structure of equal oil return air-conditioner set of the invention；
Fig. 3 is the compressor rotation control flow schematic diagram of equal oil return air-conditioning method of the invention；
Fig. 4 is set modules (i.e. outdoor unit) rotation control flow schematic diagram of equal oil return air-conditioning method of the invention；
Fig. 5 is the indoor unit rotation control flow schematic diagram of equal oil return air-conditioning method of the invention.
Appended drawing reference indicates in figure are as follows:
The first compressor of 101-, the second compressor of 102-, the first outdoor unit of 201-, the second outdoor unit of 202-, 203- third
Outdoor unit, the outer machine of 204- fourth ventricle, the first indoor unit of 301-, the second indoor unit of 302-, 303- third indoor unit, the room 30N- N
Interior machine, the first air intake duct of 401-, the second air intake duct of 402-, 5- gas-liquid separator, 601- downtake pipe, 602- second exhaust
Pipe, 7- oil eliminator, 71- refrigerant exit end, 73- oil export end, 72- input end, the equal oilhole of 801- first, the oil of 802- second
Hole, the first oil equalizing pipe of 901-, the second oil equalizing pipe of 902-, the 10- equal oil valve of oil general pipeline, 11-, the first check valve of 121-, 122-
Two check valves, the first oil return line of 13- air-breathing general pipeline, 14-, the first oil return valve of 15-, the second oil return line of 16-, 17- second are returned
Oil valve.
Specific embodiment
As shown in Figs. 1-5, the present invention provides a kind of equal oil return air-conditioner set comprising outdoor unit (the first outdoor unit 201,
The outer machine 204 of second outdoor unit 202, third outdoor unit 203, fourth ventricle) and indoor unit (the first indoor unit 301, the second indoor unit
302, third indoor unit 303, machine in fourth ventricle), the outdoor unit includes more than two compressors (the first compressions being arranged in parallel
Machine 101, the second compressor 102), and the air intake duct (the first air intake duct 401, the second air intake duct 402) of each compressor converges
And be connected with gas-liquid separator 5, exhaust pipe (downtake pipe 601, second exhaust pipe 602) converges and is connected with oil eliminator 7,
In be additionally provided on each compressor the equal oilhole (the first equal oilhole 801, the second equal oilhole 802) for its interior oil to be discharged with
And coupled oil equalizing pipe (the first oil equalizing pipe 901, the second oil equalizing pipe 902), mutually converge simultaneously between the oil equalizing pipe of each compressor
It is connected to the refrigerant exit end 71 of the oil eliminator 7.
1. equal oil return air-conditioner set of the invention, by being arranged on the compressor, that its interior oil is discharged is equal to oil eliminator
Oilhole and oil equalizing pipe, the compressor that can effectively will be enriched in oil export oil more than needed therein to oil eliminator refrigerant exit
End and then as pipeline enters the room machine, finally enters back into outdoor unit, returns to the suction side of compressor by gas-liquid separator,
So as to provide oil to the position (such as outdoor unit and compressor) for lacking oil, so that oil mass is assigned to as much as possible
It everywhere and is uniformly distributed in each compressor and outdoor unit, solves the problems, such as that oil mass distribution is uneven；
2. equal oil return air-conditioner set of the invention, by being arranged on the compressor, that its interior oil is discharged is equal to oil eliminator
Oilhole and oil equalizing pipe can also further efficiently solve the unbalanced technical problem of oil level so that oil mass is evenly distributed.
Preferably, more than two oil equalizing pipes (preferably the first oil equalizing pipe 901, the second oil equalizing pipe 902) converge connection
The refrigerant exit end is connected to by equal oil general pipeline 10 afterwards, and is provided on the equal oil general pipeline 10 and controls the pipeline on-off
Equal oil valve 11.Effectively the oil in more than two oil equalizing pipes can be converged and be guided to oily separation by the way that oil general pipeline is arranged
The outlet of device flows to indoor unit in turn, and can play the work of channel control to the oil flowed through in equal oil general pipeline by equal oil valve
With.
Preferably, being provided on each oil equalizing pipe (the first oil equalizing pipe 901, the second oil equalizing pipe 902) only allows
Oil flows to the check valve of the oil eliminator 7 from the compressor (the first compressor 101, the second compressor 102), and (first is unidirectional
Valve 121 and second one-way valve 122).It can effectively guarantee that derived oil liquid can successfully flow to room from compressor in this way
Interior machine and prevent in the lesser situation of compressor side pressure and there is a situation where flowing back, effectively preventing oil averaging process cannot
The generation for the case where going on smoothly.
Preferably, more than two air intake ducts (the first air intake duct 401, the second air intake duct 402) are converged connection and are formed
Air-breathing general pipeline 13, and the other end of the air-breathing general pipeline 13 is connected with the gas-liquid separator 5.It can by setting air-breathing general pipeline
The air intake duct for the more than two compressors being arranged in parallel is converged (or converging), and is connected to gas-liquid separator, thus
The air-flow isolated from gas-liquid separator is enabled smoothly and effectively to respectively enter more than two compressors in parallel
In.
Preferably, it is provided with the first oil return line 14 for exporting its interior oil on the gas-liquid separator 5, described
The other end of one oil return line 14 is connected to the air-breathing general pipeline 13, and is provided on first oil return line 14 and controls the pipe
First oil return valve 15 of road on-off.By the way that the first oil return line is arranged on gas-liquid separator and it is made to be connected to air-breathing general pipeline, energy
It is enough that effectively the oil in gas-liquid separator is exported and is back in compressor, to further enhance recirculating oil quantity, improve
Oil return ratio improves oily effect, and can be effectively to from gas-liquid by way of the first oil return valve is arranged on the pipeline
The control of on-off is carried out in separator via the oil to flow back in the pipeline.
It is further preferred that first oil return line connects with the gas-liquid separator is a little located at the bottom of gas-liquid separator
End position is often deposited in bottom end, can be improved in this way since often refrigerant liquid even than cold media gas is heavy for oil
From the recirculating oil quantity of oil return in gas-liquid separator and oil return efficiency (comparing from the oil that the top escape pipe of gas-liquid separator flows back and
Speech).
Preferably, the oil export end 73 of the oil eliminator 7, which is also connected with, is provided with the second oil return line 16, and described second time
The other end of oil pipe line 16 is connected on the air-breathing general pipeline 13, and is additionally provided with the second oil return on second oil return line 16
Valve 17.By being connected to the second oil return line of air-breathing general pipeline in the setting of oil export end, can will be isolated from oil eliminator
The suction side that the oil come is effectively returned to compressor improves back to more further improve the recirculating oil quantity of compressor
Oily efficiency and oily efficiency；On-off effectively can be carried out to the oil flowed through in the second oil return line by the second oil return valve
Control action.It is further preferred that being additionally provided with oil return capillary on the pipeline.
Preferably, the compressor is two, respectively the first compressor 101 and the second compressor 102, and is connected to
First air intake duct 401 of first compressor air suction mouth, the second air intake duct for being connected to second compressor air suction mouth
402, and be connected to the downtake pipe 601 of first exhaust outlet of compressor, be connected to second exhaust outlet of compressor
Second exhaust pipe 602, the downtake pipe 601 converge with the second exhaust pipe 602 be connected to the oil eliminator 7 into
Mouth end 72.
This is the compressor of equal oil return air-conditioner set of the invention when being specially two preferred constructive form and two
The preferred connection type of exhaust pipe.
Preferably, the outdoor unit is more than two, and setting parallel with one another；And/or the indoor unit be two with
On, and setting parallel with one another.This be the outdoor unit of equal oil return air-conditioner set and the preferred number of indoor unit of the invention and
Connection type.
The present invention also provides a kind of equal method for controlling oil return of equal oil return air-conditioner set, use equal oil return air-conditioning above-mentioned
Unit controls its equal oil return process.
1. the equal method for controlling oil return of equal oil return air-conditioner set of the invention, due to having used equal oil return air conditioner above-mentioned
Group is discharged its interior oil to the equal oilhole and oil equalizing pipe of oil eliminator by being arranged on the compressor, can effectively will be enriched in
Oil more than needed therein is exported into oil eliminator and then as pipeline enters the room machine, finally enters back into room by the compressor of oil
Outer machine, the suction side that compressor is returned to by gas-liquid separator, so as to position (such as outdoor unit and the pressure for lacking oil
Contracting machine etc.) oil is provided, so that oil mass is assigned to everywhere as much as possible 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 equal oil return air-conditioner set of the invention, due to having used equal oil return air conditioner above-mentioned
The equal oilhole and oil equalizing pipe of its interior oil to oil eliminator are discharged by being arranged on the compressor for group, so that oil mass is evenly distributed,
The unbalanced technical problem of oil level can also further be efficiently solved.
Preferably, when unit includes equal oil valve, and detection judges that any compressor or outdoor unit there are when oil starvation, are beaten
The equal oil valve is opened, so that the compressor of rich oil drains into oil in unit through equal oil valve, again again through indoor unit, gas-liquid separator
It is back to each machine set compressor suction side and redistributes.This is in equal method for controlling oil return of the invention when unit includes equal oil valve
When control method, can effectively make in this way rich in oil compressor distribute to oil mass shortage position, to have
The balance of each compressor chamber oil level is uniformly distributed, reached to oil mass between effect ground realization unit inner compressor.
Preferably, when unit further includes the first oil return valve and the second oil return valve, and detection judge any compressor or
When the recirculating oil quantity of outdoor unit is less than default recirculating oil quantity, first oil return valve and second oil return valve are opened.By further including
First and second oil return valves, and the means mode of two oil return valves is opened, it can effectively increase and flow back into compressor suction
Oil mass in gas side, to further increase oil return efficiency and oily efficiency.
Preferably, the rotation breakdown action when all compressors are all turned on, without compressor；This is pressure of the present invention
Specific equal oily control means when contracting machine is all turned on, directly by equal oil valve even the first and second oil return valves of unlatching into
Row oil is redistributed；
When the partial shrinkage machine in all compressors is opened, the rotation breakdown action of compressor is carried out: by the portion of unlatching
Partial compression machine is opened after running the first preset time t 1 by its frequency reducing, by inactive partial shrinkage machine, is reruned second default
After time t2, the partial shrinkage machine first opened is shut down, post-opening partial shrinkage machine operation.This is that compressor section of the present invention separates
Specific equal oily control means when opening make each compressor rotation operation of unit, can solve single pressure by the compressor wheels system of changing planes
Contracting machine longtime running between unit parallel connection compressor the problem of oil mass distribution, oil level balance, can be effectively prevented interior machine and open and hold
When measuring lower, a certain or a few compressor longtime runnings in unit effectively extend compressor service life；Realize equal oil return one
Body realizes that oil level balances between unit parallel connection compressor, oil level balance, the quick oil return of system between modularization unit, thus
It realizes that air-conditioning system is stable, safely run.
Preferably, all or part of compressor is opened according to the unlatching Capacity Selection of indoor unit.This is compression of the invention
Wheel changes the selection gist of the unlatching population size of the compressor in control means, according to the unlatching capacity of indoor unit, Neng Gougen
The quantity for targetedly opening compressor is carried out according to the size of indoor refrigeration demand, thus be effective to ensure that it is indoor enough and
Suitable refrigerating capacity and level of comfort.
Preferably, when indoor unit unlatching capacity is larger (indoor refrigeration capacity requirement is vigorous), whole compressors are opened；Work as room
Interior machine open capacity it is smaller when (indoor refrigeration capacity requirement is smaller), open partial shrinkage machine.This is equal oily controlling party of the invention
The selection of method opens the specific of number of compressors and preferably judges control mode, illustrates room when indoor unit unlatching capacity is larger
Interior refrigeration capacity requirement is vigorous, then opens whole compressors so that refrigerating capacity reaches actual demand, when indoor unit open capacity compared with
Hour illustrate that indoor refrigeration capacity requirement is smaller, then open partial shrinkage machine, it is excessive and make to prevent from opening number of compressors at this time
Room temperature is too low and influences comfort level.
Preferably, when the outdoor unit is more than two:
When all outdoor units are all turned on, without the rotation breakdown action of outdoor unit, open equal oil valve and directly carry out
Oil is redistributed；This is specific equal oily control means when compressor of the present invention is all turned on, directly by opening equal oil valve
Even the first and second oil return valves and carry out oil redistribute；
When the part outdoor unit in all outdoor units is opened, the rotation breakdown action of outdoor unit is carried out: executing single outer machine
Rotation operation or the more outer wheels of execution change operation.This is specific equal oily control means when outdoor machine part of the present invention is opened, and is led to
Outdoor unit rotation mechanism is crossed, unit each outdoor unit (set modules) rotation is run, can solve the outer machine longtime running of single chamber, machine
Between group outdoor unit in parallel the problem of oil mass distribution, oil level balance, can be effectively prevented interior machine open capacity it is lower when, in unit
A certain or several outdoor unit longtime runnings effectively extend outdoor unit service life；It realizes equal oil return integration, realizes unit simultaneously
Join oil level balance between outdoor unit, oil level balance, the quick oil return of system between modularization unit, to realize that air-conditioning system is steady
Determine, safely run.
Preferably, the outer wheel of the list changes operation are as follows: when unit starts for the first time, 1 outer machine starting, to open every time
Mutually not duplicate 1 outer machine, besides machine is turned off for it, is successively opened until all outer machine is opened successively.Such as: it will work as
When unit starts for the first time, outer machine 1 starts.The outer machine n of outer machine 2, outer machine 3 ... is shut down.When runing time t, outer machine 1 is shut down, the
When restarting, outer machine 2 starts, and the outer machine n of outer machine 3, outer machine 4 ..., outer machine 1 are shut down.The rest may be inferred carries out set modules rotation
Starting.When unit runing time is greater than t, it is primary just to carry out module rotation every t for unit runing time.This is of the invention
The outer wheel of the running list of outdoor unit rotation changes the specific of operation and controls and operates method, so that by only opening one every time
Mode achievees the effect that the realization to equal oil.
More outer wheels change operation are as follows: when unit starts for the first time, m outer machine startings, wherein 2≤m≤n, n are complete
The number of portion's outdoor unit, mutually not duplicate m outer machines, besides machine is turned off for it to open every time, is successively opened until outside all
Machine is opened successively.Such as: outer machine 1 and outer machine 2 start, and the outer machine n of outer machine 3, outer machine 4 ... is shut down.Work as compressor emergency shutdown, the
When restarting, outer machine 3, outer machine 4 start, and the outer machine n of outer machine 5, outer machine 6 ..., outer machine 1, outer machine 2 are shut down.The rest may be inferred carries out
Set modules rotation starting.This is that the running more outer wheels of outdoor unit rotation of the invention change specifically controling and operating for operation
Method, so that achieving the effect that the realization to equal oil by way of opening fixed at least two every time.
Preferably, when all indoor units are all turned on, without the rotation breakdown action of indoor unit, it is straight to open equal oil valve
Tap into redistributing for row oil；This is specific equal oily control means when compressor of the present invention is all turned on, and directly passes through unlatching
Equal oil valve even the first and second oil return valves and carry out redistributing for oil；
When the part indoor unit in all indoor units is opened, the rotation breakdown action of indoor unit is carried out: opening every time not
Mutually duplicate a indoor unit, remaining indoor unit are turned off, and successively open indoor unit until whole indoor units are turned on successively
It crosses, wherein a is the natural number less than indoor unit sum.This is specific equal oil control hand when indoor unit part of the present invention is opened
Section makes each indoor unit rotation operation of unit, can solve machine longtime running in single chamber, unit is simultaneously by indoor unit rotation mechanism
The problem of joining oil mass distribution between indoor unit, oil level balance, can be effectively prevented interior machine open capacity it is lower when, it is a certain in unit
Platform or several indoor unit longtime runnings effectively extend compressor service life；It realizes equal oil return integration, realizes unit parallel connection pressure
Oil level balance, oil level balance, the quick oil return of system between modularization unit between contracting machine, to realize that air-conditioning system is stable, peace
It runs entirely.
Preferably, keep the electric expansion valve in the indoor unit being turned on that there is a default aperture when opening indoor unit.
By indoor unit rotation mechanism, indoor unit is opened in grouping, timesharing, is given the certain aperture of electronic expansion valve of indoor unit, can will be deposited
The oil of machine of staying within drains into outdoor unit and redistributes rapidly, can not only greatly shorten the equal oil return time, keep modularization system
Oil mass distribution is balanced between system unit and oil level balances, and can also prevent the accumulation of indoor oil mass, and outer machine compressor oil starvation is reduced
Liquid hit phenomenon of modular system during equal oil return.
The working principle of the invention and preferred embodiment is described below
The invention reside in:
1. can solve single compressor longtime running, oil mass between unit parallel connection compressor by the compressor wheels system of changing planes
The problem of distribution, oil level balance；
2. can solve the problem of oil mass distribution, oil level balance between modularization unit by set modules rotation mechanism；
3. indoor unit is opened in grouping, timesharing by indoor unit rotation mechanism, given electronic expansion valve of indoor unit is centainly opened
The oil for remaining in indoor unit can be drained into outdoor unit rapidly and redistributed, can not only greatly shortened the equal oil return time, protect by degree
Oil mass distribution equilibrium and oil level balance between modular system unit are held, modular system can also be reduced during equal oil return
Liquid hit phenomenon.
By the above technology, modular system can be made to reach following effect:
1) can be effectively prevented interior machine open capacity it is lower when, No. 1 compressor longtime running of unit makes each compressor of unit
Rotation operation, can not only extend compressor service life；
2) oil return integration, realize oil level balance between unit parallel connection compressor, oil level balance between modularization unit,
The quick oil return of system, to realize that air-conditioning system is stable, safely run；
3) prevent indoor oil mass from accumulating, outer machine compressor oil starvation reduces system liquid hit phenomenon, and substantially reduces system
The equal oil return time.
The technical issues of solution:
1. can solve single compressor longtime running, oil mass between unit parallel connection compressor by the compressor wheels system of changing planes
The problem of distribution, oil level balance；
2. can solve the problem of oil mass distribution, oil level balance between modularization unit by set modules rotation mechanism；
3. indoor unit is opened in grouping, timesharing by indoor unit rotation mechanism, given electronic expansion valve of indoor unit is centainly opened
The oil for remaining in indoor unit can be drained into outdoor unit rapidly and redistributed, can not only greatly shortened the equal oil return time, protect by degree
Oil mass distribution equilibrium and oil level balance between modular system unit are held, modular system can also be reduced during equal oil return
Liquid hit phenomenon.
The utility model has the advantages that
Due to using the equal oil return controlling party of rotation formula between compressor of the invention, outdoor unit, each module of indoor unit
Method, the present invention greatly shorten compared with the traditional modular unit equal oil return time, and during system equal oil return, can prevent
Large amount of liquid refrigerant is accumulated to gas-liquid separator and causes compressor liquid hammer during equal oil return, passes through two mistakes of oil extraction and oil return
Journey redistributes oil extra in each machine set compressor, to realize that oil temperature is flat between compressor, modularization unit
Weighing apparatus, runs system safely and steadly.
System configuration:
1. the modularization oil-balancing system includes that the first compressor 101 with equal oilhole, the second compressor 102 and band first return
The gas-liquid separator 5 of oil pipe line 14；
2. the first equal oilhole 801, the second equal oilhole 802 are located at compression using a kind of high pressure cavity compressor of the equal oilhole of band
The top of machine required minimum oil level when running；
3. using a kind of gas-liquid separator 5 of the first oil return line of band 14, which is arranged in gas-liquid
The oil return hole following distance of 5 bottom of separator；
4. passing through the first check valve 121,122 fairlead of second one-way valve respectively from the equal oilhole of all parallel connection compressors
Road, all the way through equal oil valve 11 to 7 outlet pipe of oil eliminator after summarizing (i.e. at refrigerant exit)；
5. drawing the air-breathing general pipeline 13 of pipeline to gas-liquid separator 5 from the first oil return line 14 of 5 bottom of gas-liquid separator
Place.
Specific embodiment:
1. compressor rotation controls
1) machine unlatching capacity is small in, and single compressor is run unit always；
After unit normally starts, the first compressor 101 first starts, when unit runing time is equal to t1, the first compressor
101 frequency reducings, the starting of the second compressor 102, when reaching t1+t2 in the unit operation continuous working period, the first compressor 101 stops
Machine, the second compressor 102 continue to run, and are denoted as a cycle, while time t resets.When the unit duration of operation again
When reaching t1,102 frequency reducing of the second compressor, the starting of the first compressor 101, when reaching t1+t2 in the unit continuous working period, 2
Number compressor shutdown, No. 1 compressor continue to run；It is denoted as second period.So on circulate.
2) machine unlatching capacity is larger in, the operation of unit double-compressor
After unit normally starts, the first compressor 101 first starts, after compressor is run to certain frequency, No. 2 compressors
Starting.When unit operation, which is shut down, to be again started up, the compressor shutdown that the last time first starts, another compressor first starts.
It is controlled by the above compressor rotation, the compressor of rich oil drains into oil in oil eliminator through equal oil valve, then through room
Interior machine, gas-liquid separator 5 reassign in compressor, unit inner compressor oil level balance are realized, it is possible to prevente effectively from machine
The independent longtime running of the same compressor of group or in advance starting and there is oil starvation, the phenomenon that oil is hit, be conducive to system peace, steadily
Operation.
2. set modules rotation controls
1) single module unit is run
When unit starts for the first time, outer machine 1 starts.The outer machine n of outer machine 2, outer machine 3 ... is shut down.When runing time t, outside
Machine 1 is shut down, and when starting for the second time, outer machine 2 starts, and the outer machine n of outer machine 3, outer machine 4 ..., outer machine 1 are shut down.The rest may be inferred carries out machine
Group module rotation starting.
When unit runing time is greater than t, it is primary just to carry out module rotation every t for unit runing time.
2) multimode unit is run
Assuming that 2 unit operations in n (n > 2) platform unit.When unit starts for the first time, outer machine 1 and outer machine 2 start, outside
The outer machine n of machine 3, outer machine 4 ... is shut down.Work as compressor emergency shutdown, when starting for the second time, 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 starting.
When unit runing time is greater than t, it is primary just to carry out module rotation every t for unit runing time.
It is controlled by the above set modules rotation, so that the extra oil of each machine set compressor is through equal oil valve in modular system
It drains into system, then reassigns to each unit through indoor unit, gas-liquid separator 5, so that realizing that oil level is flat between each unit
Weighing apparatus.It is possible to prevente effectively from entire air-conditioning system the independent longtime running of same unit or in advance starting and there is oil starvation etc. therefore
Barrier, is conducive to system and safely and steadly runs.
3. rotation controls between indoor unit
When the equal oil return of unit multimode is run, equal oil valve, oil return valve 1, oil return valve 2 are opened, the compressor of rich oil will be higher by
The oil in compressor oil equalization hole drains into indoor unit from compressor oil equalization hole through equal oil valve, by evaporation process, passes through four by indoor unit
Port valve is back in gas-liquid separator 5, returns to the oil of gas-liquid separator, on the one hand flows to gas-liquid separator by the oil return hole of itself
Outlet pipe at, be on the one hand immediately discharged at the outlet pipe of gas-liquid separator by included oil return pipe through oil return valve 2, then pass through compression
The included gas-liquid separator of machine is back to the suction side of compressor, returns in compressor, so that all operations of modular system
Compressor in rich oil compressor oil level decline, the compressor oil level of oil starvation rises, until all operations of modular system are compressed
The oil level of machine reaches balance.
In addition, during system equal oil return, if indoor unit does not fully open, indoor unit is not opened every time t1,
A platform is opened every time, and the electric expansion valve for not opening indoor unit will give certain aperture, on the one hand guarantee not open in indoor unit
Will not there be a large amount of oil；On the other hand, due to when wheel changes unlatching in non-opening chamber blower be shutdown status, refrigerant flows through room
Without heat exchange when interior heat exchanger, so indoor unit rotation unlatching both can flow to room to avoid a large amount of liquid refrigerants of same time
Outer machine makes compressor liquid hammer, and the oil that do not open in indoor unit can be taken back outdoor unit, 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 will readily recognize that above-mentioned each advantageous manner can be free under the premise of not conflicting
Ground combination, superposition.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.With
It is only the preferred embodiment of the present invention described in upper, it is noted that for those skilled in the art, not
Under the premise of being detached from the technology of the present invention principle, several improvements and modifications can also be made, these improvements and modifications also should be regarded as this
The protection scope of invention.
Claims (14)
1. a kind of equal method for controlling oil return of equal oil return air-conditioner set, it is characterised in that: equal oil return air-conditioner set is used, it is equal to its
Oil return process is controlled, the equal oil return air-conditioner set include outdoor unit (201,202,203,204) and indoor unit (301,
302,303), the outdoor unit includes more than two compressor (101,102) being arranged in parallel, and the air-breathing of each compressor
Pipe (401,402) converges and is connected to gas-liquid separator (5), exhaust pipe (601,602) converges and is connected to oil eliminator (7), wherein often
It equal oilhole (801,802) and the oil equalizing pipe that is connected with the equal oilhole that a compressor, which is additionally provided with for its interior oil to be discharged,
(901,902), the oil equalizing pipe of each compressor mutually converge and are connected to the refrigerant exit end (71) of the oil eliminator (7)；
More than two oil equalizing pipes (901,902), which are converged, is connected to the refrigerant exit by equal oil general pipeline (10) after connection
End, and the equal oil valve (11) for controlling the pipeline on-off is provided on the equal oil general pipeline (10)；
When the outdoor unit is more than two:
When all outdoor units are all turned on, without the rotation breakdown action of outdoor unit, open equal oil valve and directly carry out oil
It redistributes；
When the part outdoor unit in all outdoor units is opened, the rotation breakdown action of outdoor unit is carried out: executing single outer wheel and change
Operation or the more outer wheels of execution change operation.
The outer wheel of the list changes operation are as follows: when unit starts for the first time, 1 outer machine starting, to open mutually not duplicate 1 every time
A outer machine, besides machine is turned off for it, is successively opened until all outer machine is opened successively；
More outer wheels change operation are as follows: when unit starts for the first time, m outer machine startings, wherein 2≤m≤n, n are whole rooms
The number of outer machine, mutually not duplicate m outer machines, besides machine is turned off for it to open every time, is successively opened until the outer machines of whole are equal
It is opened successively.
2. equal method for controlling oil return according to claim 1, it is characterised in that: in each oil equalizing pipe (901,902)
On be provided with and only oil allowed to flow to the check valves (121,122) of the oil eliminator (7) from the compressor (101,102).
3. equal method for controlling oil return described in one of -2 according to claim 1, it is characterised in that: more than two air intake ducts
(401,402) are converged connection and are formed air-breathing general pipeline (13), and the other end of the air-breathing general pipeline (13) and the gas-liquid separator
(5) it is connected.
4. equal method for controlling oil return according to claim 3, it is characterised in that: be provided on the gas-liquid separator (5)
For exporting the first oil return line (14) of its interior oil, it is total that the other end of first oil return line (14) is connected to the air-breathing
It manages (13), and is provided with the first oil return valve (15) for controlling the pipeline on-off on first oil return line (14).
5. equal method for controlling oil return according to claim 3, it is characterised in that: the oil export end of the oil eliminator (7)
(73) it is also connected with and is provided with the second oil return line (16), the other end of second oil return line (16) is connected to the air-breathing general pipeline
(13) on, and the second oil return valve (17) are additionally provided on second oil return line (16).
6. equal method for controlling oil return described in one of -2 according to claim 1, it is characterised in that: the compressor is two, point
Not Wei the first compressor (101) and the second compressor (102), and be connected to the first air-breathing of first compressor air suction mouth
Pipe (401) is connected to the second air intake duct (402) of second compressor air suction mouth, and is connected to the first compressor row
The downtake pipe (601) of port, the second exhaust pipe (602) for being connected to second exhaust outlet of compressor, the first row
The input end (72) for being connected to the oil eliminator (7) is converged in tracheae (601) and the second exhaust pipe (602).
7. equal method for controlling oil return described in one of -2 according to claim 1, it is characterised in that: the outdoor unit be two with
On, and setting parallel with one another；And/or the indoor unit is two or more, and setting parallel with one another.
8. equal method for controlling oil return according to claim 1, it is characterised in that: when unit includes equal oil valve, and detect
Judge that any compressor or outdoor unit there are when oil starvation, open the equal oil valve, so that the compressor of rich oil will through equal oil valve
Oil drains into unit, is back to each machine set compressor suction side again again through indoor unit, gas-liquid separator and redistributes.
9. equal method for controlling oil return according to claim 8, it is characterised in that: when unit further includes the first oil return valve and
When two oil return valves, and when detection judges that the recirculating oil quantity of any compressor or outdoor unit is less than default recirculating oil quantity, described the is opened
One oil return valve and second oil return valve.
10. the equal method for controlling oil return according to one of claim 8-9, it is characterised in that: when all compressors are all opened
Qi Shi, the rotation breakdown action without compressor；
When the partial shrinkage machine in all compressors is opened, the rotation breakdown action of compressor is carried out: the part of unlatching is pressed
Contracting machine is opened after running the first preset time t 1 by its frequency reducing, by inactive partial shrinkage machine, the second preset time of reruning
After t2, the partial shrinkage machine first opened is shut down, post-opening partial shrinkage machine operation.
11. equal method for controlling oil return according to claim 10, it is characterised in that: according to the unlatching Capacity Selection of indoor unit
Open all or part of compressor.
12. equal method for controlling oil return according to claim 11, it is characterised in that: when indoor unit unlatching capacity is larger,
Open whole compressors；When indoor unit unlatching capacity is smaller, partial shrinkage machine is opened.
13. the equal method for controlling oil return according to one of claim 8-9, it is characterised in that: when all indoor units are all opened
Qi Shi opens equal oil valve and directly carries out redistributing for oil without the rotation breakdown action of indoor unit；
When the part indoor unit in all indoor units is opened, the rotation breakdown action of indoor unit is carried out: opening be not overlapped mutually every time
Multiple a indoor unit, remaining indoor unit are turned off, and successively open indoor unit until whole indoor units are opened successively,
Middle a is the natural number less than indoor unit sum.
14. equal method for controlling oil return according to claim 13, it is characterised in that: keep being turned on when opening indoor unit
Indoor unit in electric expansion valve have a default aperture.
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| CN107101419A (en) * | 2017-06-20 | 2017-08-29 | 珠海格力电器股份有限公司 | Compressor return oil system, method for controlling oil return and double compressor system |
| 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 | Refrigeration system method for controlling oil return and device |
| CN108800690A (en) * | 2018-06-06 | 2018-11-13 | 青岛海信日立空调系统有限公司 | temperature control device and control method |
| CN111059733B (en) * | 2019-12-31 | 2021-09-28 | Tcl空调器(中山)有限公司 | Compressor unit control method and device |
| CN111426040B (en) * | 2020-04-03 | 2021-12-14 | 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 |
| CN115451611A (en) * | 2022-08-17 | 2022-12-09 | 三菱重工海尔(青岛)空调机有限公司 | Super air conditioner network oil return control method |
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| CN102628628A (en) * | 2012-03-19 | 2012-08-08 | 广东美的暖通设备有限公司 | Oil balancing device for multi-connected machine and control method thereof |
| KR20150050710A (en) * | 2013-10-30 | 2015-05-11 | 엘지전자 주식회사 | Air conditioner and control method of the same |
| CN104990307A (en) * | 2015-08-05 | 2015-10-21 | 珠海格力电器股份有限公司 | Air conditioner, compression module, and compression module group |
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| CN102628628A (en) * | 2012-03-19 | 2012-08-08 | 广东美的暖通设备有限公司 | Oil balancing device for multi-connected machine and control method thereof |
| KR20150050710A (en) * | 2013-10-30 | 2015-05-11 | 엘지전자 주식회사 | Air conditioner and control method of the same |
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