CN107218741A - A kind of multiple on-line system method for controlling oil return - Google Patents
A kind of multiple on-line system method for controlling oil return Download PDFInfo
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- CN107218741A CN107218741A CN201710329331.3A CN201710329331A CN107218741A CN 107218741 A CN107218741 A CN 107218741A CN 201710329331 A CN201710329331 A CN 201710329331A CN 107218741 A CN107218741 A CN 107218741A
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- compressor
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- oil level
- oil return
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000003921 oil Substances 0.000 claims abstract description 219
- 239000010725 compressor oil Substances 0.000 claims abstract description 48
- 235000003642 hunger Nutrition 0.000 claims abstract description 12
- 230000037351 starvation Effects 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 25
- 238000005057 refrigeration Methods 0.000 claims description 18
- 239000000446 fuel Substances 0.000 claims description 11
- 230000003134 recirculating effect Effects 0.000 description 12
- 238000010438 heat treatment Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 238000004378 air conditioning Methods 0.000 description 8
- 239000003507 refrigerant Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/16—Lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/03—Oil level
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of multiple on-line system method for controlling oil return, the multiple on-line system includes indoor units and multiple outdoor units, and the multiple outdoor unit is connected with the indoor units respectively；Methods described includes：Judge that multiple on-line system whether there is compressor oil starvation；Controlled if so, then entering oil return：Obtain the oil level of each compressor；Adjust the oil return frequency of each compressor respectively according to the oil level of system loading rate, each compressor；Both avoided influence system from normally running, the accurate oil return of orientation is realized again, it is ensured that oil mass is sufficient in each compressor, improves oil return reliability, improves the reliability of system operation.
Description
Technical field
It is to be related to a kind of multiple on-line system method for controlling oil return specifically the invention belongs to air-conditioning technical field.
Background technology
The use of current multiple central air conditioner is more and more universal, with the variation of architectural design, piping length and interior
Outer machine drop is increasing, in order to ensure the proper lubrication of compressor, a variety of oil return patterns of unit common design.Many outer machines
When being connected, because the duration of runs is different, each compressor of outdoor unit oil content is different, and the side of timing oil return is generally used at present
Formula, all outdoor units carry out oil return simultaneously, and output is impartial, and recirculating oil quantity is impartial, the compressor oil starvation that will necessarily be caused, some pressures
The problem of contracting oil level is excessive, causes oil return not accurate.
The content of the invention
The invention provides a kind of multiple on-line system method for controlling oil return, the problem of oil return is not accurate is solved.
In order to solve the above technical problems, the present invention is achieved using following technical proposals：
A kind of multiple on-line system method for controlling oil return, the multiple on-line system includes indoor units and multiple outdoor units, described many
Individual outdoor unit is connected with the indoor units respectively；Methods described includes：
Judge that multiple on-line system whether there is compressor oil starvation；
Controlled if so, then entering oil return：
Obtain the oil level of each compressor；
Adjust the oil return frequency of each compressor respectively according to the oil level of system loading rate, each compressor.
Further, the oil level according to system loading rate, each compressor adjusts the oil return of each compressor respectively
Frequency, is specifically included：
（1）If compressor oil level >=first sets oil level：
Judge whether system loading rate is less than or equal to assumed load rate；
If so, the compressor shutdown；
If it is not, the oil return frequency of the compressor is the first setpoint frequency；
（2）If the second setting oil level≤setting oil levels of compressor oil level ＜ first：
Judge whether system loading rate is less than or equal to assumed load rate；
If so, the oil return frequency of the compressor is the first setpoint frequency；
If it is not, the oil return frequency of the compressor is the second setpoint frequency；
（3）If the 3rd setting oil level≤setting oil levels of compressor oil level ＜ second：
Judge whether system loading rate is less than or equal to assumed load rate；
Circulated if so, the oil return frequency of the compressor is the first setpoint frequency and the second setpoint frequency；
If it is not, the oil return frequency of the compressor is the 3rd setpoint frequency；
（4）If compressor oil level ＜ the 3rd sets oil level：
The oil return frequency of the compressor is the 4th setpoint frequency；
Wherein, the setpoint frequencies of the first the 3rd setpoint frequency ＜ of setpoint frequency ＜ the second setpoint frequency ＜ the 4th；First setting oil level
The setting oil levels of ＞ second ＞ the 3rd sets oil level；The indoor set number of system loading rate=start/total of outdoor unit number.
Further, each compressor is adjusted respectively in the oil level according to system loading rate, each compressor
After oil return frequency, methods described also includes：Judge whether each compressor oil level be all higher than be equal to first setting oil level and
Continue the first setting time；If so, then exiting oil return control.
It is preferred that, the first setting time is 30 seconds.
Further, oil level≤setting oil levels of compressor oil level ＜ second are set the 3rd and system loading rate is less than
During equal to assumed load rate：The compressor runs the second setting time, the second setpoint frequency oil return with the first setpoint frequency oil return
The 3rd setting time is run, is circulated with this.
It is preferred that, setting time=3/1 of the second setting time/the 3rd.
Further, when compressor oil level ＜ the 3rd sets oil level, the electronics in the indoor set liquid pipe being not keyed up is opened
Expansion valve.
It is preferred that, the assumed load rate is 50%.
It is preferred that, the first setpoint frequency is the 20% of compressor peak frequency, and the second setpoint frequency is compressor peak frequency
40%, the 3rd setpoint frequency be compressor peak frequency 60%, the 4th setpoint frequency be compressor peak frequency 85%.
It is preferred that, the oil level of refrigeration oil in compressor is obtained by the fuel level sensor being arranged in compressor.
Compared with prior art, advantages and positive effects of the present invention are：The multiple on-line system oil return controlling party of the present invention
Method, judges that multiple on-line system whether there is compressor oil starvation；Controlled if so, then entering oil return：Obtain the oil level of each compressor；
Adjust the oil return frequency of each compressor respectively according to the oil level of system loading rate, each compressor, both avoid influence system just
Often operation, realizes the accurate oil return of orientation again, it is ensured that oil mass is sufficient in each compressor, improves oil return reliability, improves system fortune
Capable reliability.
After the embodiment that the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more clear
Chu.
Brief description of the drawings
Fig. 1 is the multiple on-line system structure chart of multiple on-line system method for controlling oil return proposed by the invention；
Fig. 2 is the flow chart of one embodiment of multiple on-line system method for controlling oil return proposed by the invention；
Fig. 3 is the flow chart of split flow in the middle part of Fig. 2.
Reference：
101st, compressor；102nd, oil eliminator；103rd, check valve；104 four-way valves；105th, outdoor heat exchanger；106th, gas-liquid separation
Device；107th, fuel level sensor；108th, electric expansion valve；109th, tracheae stop valve；110th, liquid pipe stop valve；
201st, compressor；202nd, oil eliminator；203rd, check valve；204 four-way valves；205th, outdoor heat exchanger；206th, gas-liquid separation
Device；207th, fuel level sensor；208th, electric expansion valve；209th, tracheae stop valve；210th, liquid pipe stop valve；
301st, indoor set；302nd, electric expansion valve；401st, indoor set；402nd, electric expansion valve；
501st, indoor set；502nd, electric expansion valve；601st, indoor set；602nd, electric expansion valve.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below with reference to drawings and examples,
The present invention is described in further detail.
In the multiple on-line system method for controlling oil return of the present embodiment, multiple on-line system includes indoor units and multiple outdoors
Machine, multiple outdoor units are connected with indoor units respectively, and indoor units include multiple indoor sets in parallel.
For example, multiple on-line system includes two outdoor units：First outdoor unit, the second outdoor unit；It is shown in Figure 1；First
Outdoor unit includes compressor 101, oil eliminator 102, check valve 103, four-way valve 104, outdoor heat exchanger 105, gas-liquid separator
106 etc., fuel level sensor 107 is provided with compressor 101, the oil level for detecting refrigeration oil in compressor 101.Second is outdoor
Machine includes compressor 201, oil eliminator 202, check valve 203, four-way valve 204, outdoor heat exchanger 205, gas-liquid separator 106
Deng being provided with fuel level sensor 207 in compressor 201, the oil level for detecting refrigeration oil in compressor 201.Indoor units bag
Include four indoor sets in parallel：Indoor set 301, indoor set 401, indoor set 501, indoor set 601；In the liquid pipe of indoor set 301
With electric expansion valve 302, the liquid pipe with each outdoor unit is connected respectively；There is electric expansion valve in the liquid pipe of indoor set 401
402, respectively the liquid pipe with each outdoor unit be connected；In the liquid pipe of indoor set 501 have electric expansion valve 502, respectively with it is each
The liquid pipe connection of outdoor unit；There is electric expansion valve 602, the liquid pipe with each outdoor unit connects respectively in the liquid pipe of indoor set 601
Connect；It is shown in Figure 1.
During system heating operation：
The refrigerant circulation path for being related to the first outdoor unit is compressor 101 → oil eliminator, 102 → check valve, 103 → four-way valve
104 → tracheae stop valve, 109 → indoor units → 108 → outdoor heat exchanger of liquid pipe 110 → electric expansion valve of stop valve 105 → tetra-
104 → gas-liquid separator of port valve, 106 → compressor 101.
The refrigerant circulation path for being related to the second outdoor unit is 201 → oil eliminator of compressor, 202 → check valve 203 → tetra-
209 → indoor units of port valve 204 → tracheae stop valve → 208 → outdoor heat exchanger of liquid pipe 210 → electric expansion valve of stop valve 205
204 → gas-liquid separator of → four-way valve, 206 → compressor 201.
When cooling system is run：
The circulating path for being related to the refrigerant of the first outdoor unit is compressor 101 → oil eliminator, 102 → check valve, 103 → four-way
110 → indoor units of valve 104 → outdoor heat exchanger, 105 → electric expansion valve, 108 → liquid pipe stop valve → tracheae stop valve 109 →
104 → gas-liquid separator of four-way valve, 106 → compressor 101.
The circulating path for being related to the refrigerant of the second outdoor unit be 201 → oil eliminator of compressor, 202 → check valve 203 →
210 → indoor units of four-way valve 204 → outdoor heat exchanger, 205 → electric expansion valve, 208 → liquid pipe stop valve → tracheae stop valve
209 → four-way valve, 204 → gas-liquid separator, 206 → compressor 201.
With reference to Fig. 2, the multiple on-line system method for controlling oil return of the present embodiment is illustrated, following step is specifically included
Suddenly.
Step S1：Judge that multiple on-line system whether there is compressor oil starvation.
The oil mass of refrigeration oil is corresponded with oil level in compressor, and such as oil mass 2300ml correspondences first set oil level A, oil mass
800ml correspondences second set oil level B, oil mass 400ml correspondence the 3rd and set oil level C.As oil mass >=2300ml, oil mass is sufficient；
During 800ml≤oil mass ＜ 2300ml, oil mass is moderate；During 400ml≤oil mass ＜ 800ml, oil mass is less；During oil mass ＜ 400ml, oil
Amount is not enough.Therefore, the number of oil mass can be judged by detecting the oil level of refrigeration oil in compressor.
The oil level of refrigeration oil in compressor is detected by the fuel level sensor being laid in compressor, when compressor oil level is small
When the 3rd setting oil level C, the compressor oil starvation is judged.When any compressor oil starvation in multiple on-line system, you can judge
There is compressor oil starvation in multiple on-line system, then perform step S2.
Step S2：Into oil return control.
When system enters oil return control under cooling condition：Indoor set in open state is continued to run with, and it is indoor
Blower fan remains in operation, and adjusts compressor operating frequency according to following step, it is ensured that oil return is carried out while refrigeration.
When system enters oil return control under heating condition：Four-way valve does not commutate, and refrigerant circulation direction is constant, in start
The indoor set of state is run, and its indoor fan remains in operation, and compressor operating frequency is adjusted according to following step, it is ensured that
Oil return is carried out while heating effect.
Multiple on-line system enters oil return operational mode, and the step mainly comprises the steps, shown in Figure 3.
Step S21：Obtain the oil level of each compressor.
The oil level of refrigeration oil in compressor is obtained by the fuel level sensor being laid in compressor.
Step S22：Adjust the oil return frequency of each compressor respectively according to the oil level of system loading rate, each compressor.
In this step, following controls are carried out respectively to each compressor：
（1）If compressor oil level >=first sets oil level A, illustrate that the compressor oil mass is sufficient.
Judge whether system loading rate is less than or equal to assumed load rate.
If system loading rate≤assumed load rate, illustrate that system loading rate is smaller, even if the compressor shutdown, remaining compression
Machine can also afford the load of whole system；And because the compressor oil mass is sufficient, without oil return；Therefore the compressor stops
Machine, had both avoided the excessive oil return of the compressor, has nor affected on the operation of whole system.
, may shadow if the compressor is shut down if system loading rate ＞ assumed load rates, illustrate that system loading rate is larger
The normal operation of acoustic system, therefore the compressor do not shut down；Compressor oil return frequency is bigger, is recovered to the refrigeration oil of the compressor
Oil mass is bigger, because the compressor oil mass is sufficient, therefore the oil return frequency of the compressor is the first setpoint frequency, the first setting frequency
Rate is the minimum running frequency of compressor（Such as the 20% of compressor maximum frequency of operation）, compressor oil return operation.That is, the pressure
Contracting machine is run with less frequency oil return, has both ensured the refrigeration or heating effect of air-conditioning, causes that the compressor recirculating oil quantity is less again,
Avoid influenceing the recirculating oil quantity of other compressors.
（2）If the second setting oil level B≤setting oil level A of compressor oil level ＜ first, illustrates that the compressor oil mass is moderate.
Judge whether system loading rate is less than or equal to assumed load rate.
If system loading rate≤assumed load rate, illustrate that system loading rate is smaller, the oil return frequency of the compressor is first
Setpoint frequency, compressor oil return operation.That is, the compressor is run with less frequency oil return, both ensured air-conditioning refrigeration or
Heating effect, causes the compressor to have certain recirculating oil quantity, slowly adds in the compression again.
If system loading rate ＞ assumed load rates, illustrate that system loading rate is larger, the oil return frequency of the compressor is second
Setpoint frequency（Such as the 40% of compressor maximum frequency of operation）, the second setpoint frequency is more than the first setpoint frequency, the compressor oil return
Operation.That is, the compressor is run with moderate frequency oil return, both can guarantee that the refrigeration or heating effect of air-conditioning, and the pressure is caused again
Contracting machine has certain recirculating oil quantity, slowly adds in the compressor.
（3）If the 3rd setting oil level C≤setting oil level B of compressor oil level ＜ second, illustrates that the compressor oil mass is less.
Judge whether system loading rate is less than or equal to assumed load rate.
If system loading rate≤assumed load rate, illustrate that system loading rate is smaller, the oil return frequency of the compressor is first
Setpoint frequency and the circulation of the second setpoint frequency, compressor oil return operation.That is, the compressor with the relatively small frequency of intermittent cyclic and
Moderate frequency oil return operation, had both ensured the refrigeration or heating effect of air-conditioning, and had caused the compressor to have a suitable recirculating oil quantity again,
Slowly add in the compressor.
In the present embodiment, the compressor runs the second setting time, the second setpoint frequency with the first setpoint frequency oil return
Oil return runs the 3rd setting time, is circulated with this；Both the cooling or heating effect of air-conditioning had been ensured, and again the compressor recirculating oil quantity had been fitted
In.
In the present embodiment, setting time=3/1 of the second setting time/the 3rd.If the second setting time is 3 minutes, the 3rd
Setting time is 1 minute.I.e. the compressor runs 3 minutes, 1 point of the second setpoint frequency oil return operation with the first setpoint frequency oil return
Clock, is circulated with this, has both ensured the refrigeration or heating effect of air-conditioning, ensures that the compressor recirculating oil quantity is moderate again, while avoiding excess
Oil suction causes other compressor recirculating oil quantities to diminish.
If system loading rate ＞ assumed load rates, illustrate that system loading rate is larger, the oil return frequency of the compressor is the 3rd
Setpoint frequency（Such as the 60% of compressor maximum frequency of operation）, the 3rd setpoint frequency is more than the second setpoint frequency, the compressor oil return
Operation.That is, the compressor is run with moderate frequency oil return, has both ensured air conditioner refrigerating or heating effect, and the compressor is caused again
Recirculating oil quantity is moderate.
（4）If compressor oil level ＜ the 3rd sets oil level, illustrate the compressor low on fuel.
If compressor low on fuel, the oil return frequency of the compressor is the 4th setpoint frequency（Such as compressor maximum operation
The 85% of frequency）, the 4th setpoint frequency is more than the 3rd setpoint frequency, compressor oil return operation.Due to the compressor oil mass not
Foot, therefore the compressor oil return frequency is higher, to ensure that the compressor has more oil return.
In compressor low on fuel, in order to ensure more recirculating oil quantity, by the electronics in the indoor set liquid pipe being not keyed up
Expansion valve is opened, in order to reclaim the refrigeration oil being not keyed up in indoor set, to ensure to save bit by bit the freezing in indoor set is not keyed up
Oil is returned in compressor, improves the recirculating oil quantity of compressor.
The indoor set number of system loading rate=start/total of outdoor unit number.If all indoor sets, all outdoor units are all opened
Machine is run, then system loading rate is 100%.
In the present embodiment, assumed load rate is 50%.When system loading rate is less than 50%, illustrate to the demand of air-conditioning compared with
Small, the output of compressor is able to ensure that indoor set effect during oil return.Illustrate：A number for two compressors is respectively 5HP, room
Outer total number of machine is 10HP, and total number of indoor set is 10HP;The oil level ＞ A of wherein the first compressor, the second compressor
Oil level ＜ C, the indoor set number of start is 4HP, then system loading rate is 40%, according to above-mentioned control logic, First compression
Machine is shut down, and the second compressor is operated according to 85% output, i.e. 5 HP * 0.85=4.25HP ＞ 4HP, i.e. a compressor is transported
Turn that refrigeration can be met or heat requirement.Therefore, assumed load rate elects 50% as, both can guarantee that refrigeration or heating effect, has met back again
Oily demand.
The setpoint frequencies of first the 3rd setpoint frequency ＜ of setpoint frequency ＜ the second setpoint frequency ＜ the 4th；First setting oil level A
The setting oil level B of ＞ second ＞ the 3rd set oil level C.
In the present embodiment, the first setpoint frequency be compressor peak frequency 20%, the second setpoint frequency be compressor most
The 40% of big frequency, the 3rd setpoint frequency is the 60% of compressor peak frequency, and the 4th setpoint frequency is compressor peak frequency
85%。
The multiple on-line system method for controlling oil return of the present embodiment, judges that multiple on-line system whether there is compressor oil starvation；If
It is then to enter oil return and control：Obtain the oil level of each compressor；Adjusted respectively according to the oil level of system loading rate, each compressor
The oil return frequency of whole each compressor, had both avoided influence system from normally running, and the accurate oil return of orientation was realized again so that the pressure of oil starvation
The few oil return of the compressor of many oil returns of contracting machine, not oil starvation, it is ensured that oil mass is sufficient in each compressor, improves oil return reliability, improves
The reliability of system operation.
In order to avoid system exits oil return too early, it is ensured that oil mass is sufficient in each compressor, after step s 22, described
Method also includes：
Step S23：When judging whether that the oil level of each compressor is all higher than equal to the first setting oil level A and continues the first setting
Between.
If it is not, explanation oil return is insufficient, also need to continue oil return, then return to step S21.
If so, illustrating that the oil mass of each compressor is sufficient and stably, without continuing oil return, then step S24 is performed.
Step S24：Exit oil return control.
When the oil level of each compressor is more than or equal to the first setting oil level A and continues the first setting time, just exit back
Oil control, i.e., just exit oil return control after each compressor oil mass is sufficient and oil level is stable；So as to ensure each compressor oil
Amount is sufficient and oil level is stable, it is to avoid due to frequently entering oil return control caused by oil level fluctuation, it is ensured that the normal operation of system, carry
The reliability of high system operation.
In the present embodiment, the first setting time is 30 seconds, had both ensured the oil mass abundance of each compressor and oil level is stable,
Overlong time is avoided to cause excessive oil return again.
Exit after oil return control, multiple on-line system is continued to run with according to the pattern before oil return is controlled is entered.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than is limited；Although with reference to foregoing reality
Apply example the present invention is described in detail, for the person of ordinary skill of the art, can still implement to foregoing
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic；And these are changed or replaced
Change, the essence of appropriate technical solution is departed from the spirit and scope of claimed technical solution of the invention.
Claims (10)
1. a kind of multiple on-line system method for controlling oil return, it is characterised in that：The multiple on-line system includes indoor units and multiple
Outdoor unit, the multiple outdoor unit is connected with the indoor units respectively；Methods described includes：
Judge that multiple on-line system whether there is compressor oil starvation；
Controlled if so, then entering oil return：
Obtain the oil level of each compressor；
Adjust the oil return frequency of each compressor respectively according to the oil level of system loading rate, each compressor.
2. control method according to claim 1, it is characterised in that：It is described according to system loading rate, each compressor
Oil level adjusts the oil return frequency of each compressor respectively, specifically includes：
（1）If compressor oil level >=first sets oil level：
Judge whether system loading rate is less than or equal to assumed load rate；
If so, the compressor shutdown；
If it is not, the oil return frequency of the compressor is the first setpoint frequency；
（2）If the second setting oil level≤setting oil levels of compressor oil level ＜ first：
Judge whether system loading rate is less than or equal to assumed load rate；
If so, the oil return frequency of the compressor is the first setpoint frequency；
If it is not, the oil return frequency of the compressor is the second setpoint frequency；
（3）If the 3rd setting oil level≤setting oil levels of compressor oil level ＜ second：
Judge whether system loading rate is less than or equal to assumed load rate；
Circulated if so, the oil return frequency of the compressor is the first setpoint frequency and the second setpoint frequency；
If it is not, the oil return frequency of the compressor is the 3rd setpoint frequency；
（4）If compressor oil level ＜ the 3rd sets oil level：
The oil return frequency of the compressor is the 4th setpoint frequency；
Wherein, the setpoint frequencies of the first the 3rd setpoint frequency ＜ of setpoint frequency ＜ the second setpoint frequency ＜ the 4th；
First setting oil level ＞ second sets oil level ＞ the 3rd and sets oil level；
The indoor set number of system loading rate=start/total of outdoor unit number.
3. control method according to claim 2, it is characterised in that：Described according to system loading rate, each compressor
Oil level adjust the oil return frequency of each compressor respectively after, methods described also includes：
Judge whether that the oil level of each compressor is all higher than being equal to the first setting oil level and continues the first setting time；
If so, then exiting oil return control.
4. control method according to claim 3, it is characterised in that：First setting time is 30 seconds.
5. control method according to claim 2, it is characterised in that：Oil level≤compressor oil level ＜ second is set the 3rd
When setting oil level and system loading rate and being less than or equal to assumed load rate：
When the compressor runs the second setting time, the second setpoint frequency oil return the 3rd setting of operation with the first setpoint frequency oil return
Between, circulated with this.
6. control method according to claim 5, it is characterised in that：Setting time=3/1 of second setting time/the 3rd.
7. control method according to claim 2, it is characterised in that：When compressor oil level ＜ the 3rd sets oil level, beat
Open the electric expansion valve in the indoor set liquid pipe being not keyed up.
8. control method according to claim 2, it is characterised in that：The assumed load rate is 50%.
9. control method according to claim 2, it is characterised in that：First setpoint frequency is compressor peak frequency
20%, the second setpoint frequency is the 40% of compressor peak frequency, and the 3rd setpoint frequency is the 60% of compressor peak frequency, the 4th
Setpoint frequency is the 85% of compressor peak frequency.
10. control method according to any one of claim 1 to 9, it is characterised in that：By being arranged in compressor
Fuel level sensor obtains the oil level of refrigeration oil in compressor.
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Effective date of registration: 20201110 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee after: QINGDAO HAIER AIR-CONDITIONING ELECTRONIC Co.,Ltd. Patentee after: Haier Smart Home Co., Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Patentee before: QINGDAO HAIER AIR-CONDITIONING ELECTRONIC Co.,Ltd. |