CN102650479A - Multiple connected air-conditioning unit and oil circuit system thereof - Google Patents

Multiple connected air-conditioning unit and oil circuit system thereof Download PDF

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Publication number
CN102650479A
CN102650479A CN2011100440506A CN201110044050A CN102650479A CN 102650479 A CN102650479 A CN 102650479A CN 2011100440506 A CN2011100440506 A CN 2011100440506A CN 201110044050 A CN201110044050 A CN 201110044050A CN 102650479 A CN102650479 A CN 102650479A
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CN
China
Prior art keywords
oil
compressor
eliminator
air conditioning
oil eliminator
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CN2011100440506A
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Chinese (zh)
Inventor
代文杰
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珠海格力电器股份有限公司
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Priority to CN2011100440506A priority Critical patent/CN102650479A/en
Publication of CN102650479A publication Critical patent/CN102650479A/en

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a multiple connected air-conditioning unit and an oil circuit system thereof. The oil circuit system comprises two or more compressor sets, wherein each compressor set comprises one or more parallel compressors and an oil separator; the compressor sets comprise at least one variable frequency compressor; the inlet of the oil separator in each compressor set is connected with the refrigerant outlet of each compressor in the compressor set; the oil return opening of the oil separator in the compressor set is connected with the refrigerant inlet of each compressor in another compressor set or other compressor sets, so as to form an oil return pipeline; and an oil pipe is connected between each two adjacent oil separators. The oil circuit system has the advantages that the quantity of the oil separators is reduced; the whole oil circuit system can be controlled integrally; and refrigeration oil can be balanced, circulated and distributed fast according to pressure variation in the system, namely the opening condition of the compressors in the system.

Description

VRF Air Conditioning System and oil piping system thereof
Technical field
The present invention relates to air conditioner, relate in particular to a kind of VRF Air Conditioning System and oil piping system thereof.
Background technology
VRF Air Conditioning System is the air-conditioning system that is made up of the indoor set of an identical or different form of off-premises station linking number platform and capacity.The multi-connected air conditioner device is widely used in the various occasions that we work, live at present.VRF Air Conditioning System, especially connected unit, because the existence of intrinsic advantage can be satisfied under the situation of different load, the output respective capabilities obtains best efficiency value and satisfies the requirement of user for comfortableness and energy saving.Along with the degree of recognition of many online group improves constantly, also the beginning of commercial unit is incorporated into businessfice such as hotel, apartment, office building in a large number, and this has proposed corresponding demand with regard to meaning the maximization to unit capacity.
In VRF Air Conditioning System, each indoor set links to each other through pipeline with off-premises station, forms the pipe network system of an enclosed.In this pipe network system, be provided with oil eliminator; This oil eliminator is installed between compressor outlet and the condenser inlet; To separate from the refrigeration oil in the mist of the refrigerant of compressor and refrigeration oil, and be back to the refrigerant import of compressor through the oil return opening of oil eliminator bottom.Oil eliminator has played refrigerant and the effect of reclaiming refrigeration oil of separating.
Because multi-connected air conditioner will often be faced the operation conditions of demand under different load, different operating modes or the like condition, multi-connected air conditioning system has very high requirement for the appropriate design of compressor oil circuit.Many online group that capacity is less; Corresponding number of compressors is also less relatively; Oil eliminator can satisfy the demands under the situation mostly; Along with the rising of number of compressors, oil eliminator is because the restriction of structure and effect can not infinitely increase then, and the inevitable requirement system increases the oil eliminator of different numbers.Some producer has adopted a kind of way of each compressor built-in oil separator, but this way causes the oil eliminator One's name is legion, divides oily effect to be difficult to guarantee; The freezing oil circuit of whole control in the time of also can't satisfying a plurality of compressor operating, the requirement that distributes refrigeration oil; Therefore need a kind of novel oil return mode of design, can adjust the oil piping system of compressor bank automatically according to the compressor situation of starting shooting; Integral dispensing system refrigeration oil guarantees the system reliability requirement.
Summary of the invention
Technical problem to be solved by this invention provide a kind of can the freezing oil circuit of whole control, distribute refrigeration oil, and then can guarantee that all there is the oil piping system of the VRF Air Conditioning System of enough refrigeration oils in any moment in the compressor.
For solving the problems of the technologies described above, according to an aspect of the present invention, a kind of oil piping system of VRF Air Conditioning System is provided, comprise two or more Compressor Group, wherein comprise in each Compressor Group: one or more the compressors that parallel connection is provided with; And an oil eliminator, comprise at least one frequency-changeable compressor in these two or more Compressor Group, wherein, the import of the oil eliminator in each Compressor Group is connected with the refrigerant exit of each compressor in this Compressor Group; The oil return opening of the oil eliminator in each Compressor Group is connected with the refrigerant import of each compressor in other one or more Compressor Group, forms return line; Be connected with oil equalizing pipe between each oil eliminator.
Further, the refrigerant exit of each compressor is connected with the import of oil eliminator through public pipeline in each Compressor Group.
Further, the refrigerant import of each compressor is connected with the oil return opening of oil eliminator through public pipeline in each Compressor Group.
Further, be provided with magnetic valve in the return line.
Further, the quantity of magnetic valve is identical with the quantity of compressor, and each magnetic valve is separately positioned in the return line of every compressor.
Further, each oil eliminator is arranged on the same height; The two ends of oil equalizing pipe lay respectively at the same height place of its oil eliminator that connects.
Further, also be provided with filter in the return line.
Further, also be provided with the oil return capillary in the return line, the oil return capillary is positioned at along the downstream of the direction filter of the refrigerant import of oil return opening to compressor.
Further, in each Compressor Group, be provided with check valve between the refrigerant exit of each compressor and the oil eliminator.
According to another aspect of the present invention, a kind of VRF Air Conditioning System is provided also, has comprised according to any above-mentioned oil piping system.
The present invention has following beneficial effect:
Among the present invention; An oil eliminator is set in each Compressor Group; The import of this oil eliminator is connected with the refrigerant exit of each compressor in this Compressor Group, and the refrigerant that each compressor in this Compressor Group is exported separates with the mist of refrigeration oil.Mist is through behind the oil eliminator, and refrigeration oil is separated, through the oil return opening of oil eliminator bottom, enters into the refrigerant import of each compressor of other Compressor Group, and then gets in these compressors afterwards.Also be connected with oil equalizing pipe between the oil eliminator.So just reduce oil eliminator quantity and realized the whole oil piping system of whole control.
Particularly; Because the oil return opening of each oil eliminator bottom all is connected to the refrigerant import of each compressor in other Compressor Group; When and whole discharge capacity second group Compressor Group being attached thereto higher when the whole discharge capacity of first group of Compressor Group is low; Inlet in the oil eliminator in first group of Compressor Group is greater than discharge rate, and the inlet of the oil eliminator in second group of Compressor Group is less than discharge rate, thereby lower than the oil level in the oil eliminator in first group of Compressor Group.In addition; Because the pressure in the oil eliminator is directly proportional with the output pressure of this Compressor Group basically; Thereby the pressure in the oil eliminator in first Compressor Group is greater than the pressure in the oil eliminator in second Compressor Group; This has accelerated the oil level balancing speed of two oil eliminators greatly, more quickly the higher compressor of discharge capacity is carried out refrigeration oil and replenishes.Thus, just make it possible to the variation according to pressure in the system, the situation of just opening according to compressor in the system is balance, circulation and distribution refrigeration oil apace.
Except top described purpose, feature and advantage, the present invention also has other purpose, feature and advantage.To do further detailed explanation to the present invention with reference to figure below.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the sketch map according to the oil piping system of the VRF Air Conditioning System of the first embodiment of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
As shown in Figure 1; Oil piping system according to VRF Air Conditioning System of the present invention comprises two or more Compressor Group; Wherein comprise one or more the compressors that parallel connection is provided with in each Compressor Group; And an oil eliminator, comprise at least one frequency-changeable compressor in these two or more Compressor Group.In each Compressor Group; The import of oil eliminator is connected with the refrigerant exit of each compressor in this Compressor Group; Simultaneously; The oil return opening of the oil eliminator in this Compressor Group is connected with the refrigerant import of each compressor in other one or more Compressor Group, forms return line.In addition, be connected with oil equalizing pipe between each oil eliminator.
In Fig. 1, in the oil piping system according to the VRF Air Conditioning System of the first embodiment of the present invention, this oil piping system comprises first Compressor Group 1 and second Compressor Group 3.First Compressor Group 1 comprises first compressor 11 and second compressor 12 that parallel connection is provided with, and first oil eliminator 13.Second Compressor Group 3 comprises the 3rd compressor 31 and the 4th compressor 32 that parallel connection is provided with, and second oil eliminator 33.In the present embodiment, first compressor 11 is a frequency-changeable compressor, and all the other are invariable frequency compressor.Can see that from Fig. 1 the refrigerant exit of the 3rd compressor 31 in the oil return opening of first oil eliminator 13 and second Compressor Group 3 and the refrigerant exit of the 4th compressor 32 are connected, form return line; The refrigerant exit of first compressor 11 in the oil return opening of second oil eliminator 33 and first Compressor Group 1 and the refrigerant exit of second compressor 12 are connected, and form return line.Connect through oil equalizing pipe between first oil eliminator 13 and second oil eliminator 33.
Above-mentioned connected mode makes that oil eliminator quantity reduces in the oil piping system of this VRF Air Conditioning System, and has realized the whole oil piping system of whole control.Particularly, be example with the present embodiment, owing to comprise frequency-changeable compressor in first Compressor Group 1; All the other compressors are invariable frequency compressor; When opening the air-conditioning unit, normal opening sequence is: at first open frequency-changeable compressor (first compressor 11), increase its output frequency gradually; Reach the peak of permission in frequency after, continue to open the 3rd compressor 31 and the 4th compressor 32 in second compressor 12 and second Compressor Group 3 in order according to the temperature requirement of setting.Be appreciated that; During the work of air-conditioning unit; The discharge capacity of first Compressor Group 1 is higher and whole discharge capacity second Compressor Group 3 is lower; Thereby the refrigeration oil inlet in first oil eliminator 13 is greater than discharge rate, and the refrigeration oil inlet in second oil eliminator 33 is less than discharge rate, and the oil level in first oil eliminator 13 is higher than the oil level in second oil eliminator 33 thus.The existence of oil equalizing pipe is flowed the refrigeration oil in the oil eliminator 13 of winning in second oil eliminator 33.The more important thing is; Because the pressure in each oil eliminator is directly proportional with the output pressure of this Compressor Group basically; Thereby the pressure in first oil eliminator 13 is greater than the pressure in second oil eliminator 33; This pressure differential has been accelerated the oil level balancing speed of two oil eliminators greatly, more quickly the first higher Compressor Group 1 of discharge capacity is carried out refrigeration oil and replenishes.Thus, just make it possible to the variation according to pressure in the system, the situation of just opening according to compressor in the system is balance, circulation and distribution refrigeration oil apace.
In the present embodiment, the oil piping system of VRF Air Conditioning System comprises two Compressor Group, includes two compressors in each Compressor Group, wherein, comprises a frequency-changeable compressor in first Compressor Group.In practice, the quantity of the quantity of compressor and frequency-changeable compressor can be as the case may be and different in the quantity of compressor bank, each compressor bank.
As shown in Figure 1, in the present embodiment, the refrigerant exit of each compressor is connected with the import of oil eliminator through public pipeline in each Compressor Group, and this public pipeline is meant that unit is normally in service, the pipeline of transportation refrigerant; The refrigerant import of each compressor is connected with the oil return opening of oil eliminator through public pipeline in each Compressor Group.In practice, the refrigerant exit of each compressor in each Compressor Group also can be connected with the import of corresponding oil eliminator with other suitable manner.
Preferably, in the present embodiment, be provided with magnetic valve in the above-mentioned return line, so that can be when compressor opens and cut out, its corresponding return line of opening and closing correspondingly.More preferably, the quantity of magnetic valve is identical with the quantity of compressor, and each magnetic valve is separately positioned in the return line of every compressor.Just, in the present embodiment, be connected in the return line of refrigerant import of first compressor 11 and be provided with first magnetic valve 14, be connected in the return line of refrigerant import of second compressor 12 and be provided with second magnetic valve 15; Likewise, be connected in the return line of refrigerant import of the 3rd compressor and be provided with the 3rd magnetic valve 34, be connected in the return line of refrigerant import of the 4th compressor and be provided with the 4th magnetic valve 35.Like this, when whole air-conditioning unit is worked, can be according to the opening and closing situation opening and closing corresponding solenoid valve of compressor.For example when first compressor 11 is opened, correspondingly open first magnetic valve 14, and first compressor 11 correspondingly cuts out first magnetic valve 14 when cutting out.
Can also see that from Fig. 1 in the present embodiment, preferably, each oil eliminator is arranged on the same height; The two ends of oil equalizing pipe lay respectively at the same height place of its oil eliminator that connects.Thereby exactly balance with distribute refrigeration oil.
Preferably, also be provided with filter in the return line.Particularly, be provided with first filter 16, be provided with second filter 36, be used for the refrigeration oil that oil eliminator is discharged is filtered at the oil return opening place of second oil eliminator 33 at the oil return opening place of first oil eliminator 13.
Preferably, also be provided with the oil return capillary in the return line, the oil return capillary is positioned at along the downstream of the direction filter of the refrigerant import of oil return opening to the compressor of oil eliminator, plays the effect of throttling.Particularly, in the present embodiment, the first oil return capillary 17 is arranged in the return line that is connected to first compressor 11, the downstream of first filter 16; The second oil return capillary 18 is arranged in the return line that is connected to second compressor 12, the downstream of first filter 16; The 3rd oil return capillary 37 is arranged in the return line that is connected to second compressor 31, the downstream of second filter 36; The 4th oil return capillary 38 is arranged in the return line that is connected to second compressor 32, the downstream of second filter 17.
Preferably, in each Compressor Group, be provided with check valve between the refrigerant exit of each compressor and the oil eliminator, to guarantee the flow direction of refrigerant and refrigeration oil.
The present invention also provides a kind of VRF Air Conditioning System, comprises above-mentioned any oil piping system.
VRF Air Conditioning System of the present invention can both satisfy the circulation of system compresses machine refrigeration oil and the reliability requirement of system under the why not situation with operating condition and operating load in office.
When the oil piping system oepration at full load of present embodiment; The operation of first compressor 11 (frequency-changeable compressor) high frequency; Second compressor 12, the 3rd compressor 31 and the 4th compressor 32 are opened operation, and the oil circuit distribution situation of system is such: first magnetic valve 14, second magnetic valve 15, the 3rd magnetic valve 34 and the 4th magnetic valve 35 are all opened.The mist of first compressor 11 and second compressor, 12 output compression refrigerants and refrigeration oil; Make refrigeration oil along with refrigerant enters in first oil eliminator 13; After first oil eliminator 13 separated mist, refrigeration oil was separated, accumulate in first oil eliminator 13, and refrigeration oil is through the oil return opening pipeline of first oil eliminator, 13 bottoms; Flow through successively second filter 36, the 3rd oil return capillary 37; Enter at last in the 3rd compressor 31, flow through successively simultaneously second filter 36, the 4th oil return capillary 38 are got back in the 4th compressor 32.Similarly; The mist of the 3rd compressor 31 and the 4th compressor 32 output compression refrigerants and refrigeration oil makes refrigeration oil along with refrigerant enters in second oil eliminator 33, after second oil eliminator 33 separates mist; Refrigeration oil is separated, accumulate in second oil eliminator 33; The oil return opening pipeline of refrigeration oil through second oil eliminator, 33 bottoms, flow through successively first filter 16, the first oil return capillary 17 enter in first compressor 11 at last; Flow through successively simultaneously first filter 16, the second oil return capillary 18 are got back in second compressor 12.If oil level has certain height poor in two oil contents, the refrigeration oil of oil level upper side can flow to the low side of oil level through the oil equalizing pipe between two oil contents, and the system oil level of making reaches poised state.
When the oil piping system operation at part load of present embodiment; As when only requiring the situation of opening 3 compressors; Second compressor 32 is out of service, and the system oil-way distribution situation is such: first magnetic valve 14, second magnetic valve 15, the 3rd magnetic valve 34 are opened, and the 4th magnetic valve 35 cuts out.The mist of first compressor 11 and second compressor, 12 output compression refrigerants and refrigeration oil; Make refrigeration oil along with refrigerant enters in first oil eliminator 13; After first oil eliminator 13 separated mist, refrigeration oil was separated, accumulate in first oil eliminator 13, and refrigeration oil is through the oil return opening pipeline of first oil eliminator, 13 bottoms; Flow through successively second filter 36, the 3rd oil return capillary 37 enter in the 3rd compressor 31 at last.Similarly; The mist of the 3rd compressor 31 output compression refrigerants and refrigeration oil makes refrigeration oil along with refrigerant enters in second oil eliminator 33, after second oil eliminator 33 separates mist; Refrigeration oil is separated, accumulate in second oil eliminator 33; The oil return opening pipeline of refrigeration oil through second oil eliminator, 33 bottoms, flow through successively first filter 16, the first oil return capillary 17 enter in first compressor 11 at last; Flow through successively simultaneously first filter 16, the second oil return capillary 18 are got back in second compressor 12.The refrigeration oil oil mass that gets in such cases in first oil eliminator 13 is the oil drain quantity of first compressor 11 and second compressor 12; And the oil mass of discharging first oil eliminator 13 just offers the oil mass of the 3rd compressor 31; The inlet of first oil eliminator 13 is greater than discharge rate, so the oil level in first oil eliminator 13 is higher; And the situation of second oil eliminator 33 is whole good opposite, and oil level is lower, because the existence of oil equalizing pipe is arranged, refrigeration oil flows to low oil level by high oil level.Output pressure value after the very important point in addition, first oil eliminator, 13 internal pressure values equal first compressor 11 and second compressor 12 basically and combine, and the force value of second oil eliminator 33 equals the force value of the 3rd compressor 31 basically.This kind load has caused the force value in first oil eliminator 13 to be slightly larger than the force value of second oil eliminator 33; The oil level balancing speed of two oil contents has been accelerated in the existence of this pressure differential greatly just, more quickly first Compressor Group 1 is carried out refrigeration oil and replenishes.Because the variation of system pressure value is relevant with the actual unlatching situation of compressor, distributes thereby the refrigeration oil system is really reached by the actual demand balance.
When system operation sub-load, as the system that only requires is when opening the situation of 1 or 2 compressors, and when for example system had only first compressor 11 to open, first magnetic valve 14 was opened, and second magnetic valve 15, the 3rd magnetic valve 34, the 4th magnetic valve 35 are closed; Perhaps first compressor 11, when second compressor 12 is opened, first magnetic valve 14, second magnetic valve 15 are opened, the 3rd magnetic valve 34, the 4th magnetic valve 35 are closed.In the case, after refrigeration oil gets into first oil eliminator 13, because the 3rd compressor 31 and the 4th compressor 32 all do not have to open; Do not have the refrigeration oil demand, thus refrigeration oil accumulate in first oil eliminator 13, when reaching equal hydraulic fluid port height; Be discharged to second oil eliminator 33 through oil equalizing pipe, return in the compressor that needs refrigeration oil, accomplish the refrigeration oil circulation of system; Because the force value of start side; Promptly the force value in first oil eliminator 13 is much larger than the force value of the side of not starting shooting, i.e. force value in second oil eliminator 33 is so intrasystem oil piping system can reach balance and circulation rapidly.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. the oil piping system of a VRF Air Conditioning System comprises two or more Compressor Group (1,3), wherein comprises in each Compressor Group (1,3):
One or more the compressors (11,12 that parallel connection is provided with; 31,32); And
An oil eliminator (13,33),
Wherein, comprise at least one frequency-changeable compressor in said two or more Compressor Group (1,3),
It is characterized in that,
Wherein, the refrigerant exit of each compressor is connected in the import of the said oil eliminator (13,33) in each Compressor Group (1,3) and this Compressor Group (1,3);
The refrigerant import of each compressor is connected in the oil return opening of the said oil eliminator (13,33) in each Compressor Group (1,3) and other one or more Compressor Group (1,3), forms return line;
Be connected with oil equalizing pipe between said each oil eliminator (13,33).
2. the oil piping system of VRF Air Conditioning System according to claim 1 is characterized in that, the refrigerant exit of each compressor is connected through the import of public pipeline and said oil eliminator (13,33) in said each Compressor Group (1,3).
3. the oil piping system of VRF Air Conditioning System according to claim 1 is characterized in that, the refrigerant import of each compressor is connected through the oil return opening of public pipeline and said oil eliminator (13,33) in said each Compressor Group (1,3).
4. the oil piping system of VRF Air Conditioning System according to claim 1 is characterized in that, is provided with magnetic valve (14,15 in the said return line; 34,35).
5. the oil piping system of VRF Air Conditioning System according to claim 4 is characterized in that, said magnetic valve (14,15; 34,35) quantity and said compressor (11,12; 31,32) quantity is identical, and each magnetic valve is separately positioned on every compressor (11,12; 31,32) in the return line.
6. the oil piping system of VRF Air Conditioning System according to claim 1 is characterized in that,
Said each oil eliminator (13,33) is arranged on the same height;
The two ends of said oil equalizing pipe lay respectively at the same height place of its oil eliminator that connects (13,23).
7. the oil piping system of VRF Air Conditioning System according to claim 1 is characterized in that, also is provided with filter (16,36) in the said return line.
8. the oil piping system of VRF Air Conditioning System according to claim 7 is characterized in that, also is provided with oil return capillary (17,18 in the said return line; 37,38), said oil return capillary (17,18; 37,38) be positioned at the extremely downstream of the said filter of direction (16,36) of the refrigerant import of said compressor of the said oil return opening in edge.
9. the oil piping system of VRF Air Conditioning System according to claim 1 is characterized in that, in each said Compressor Group (1,3), and each compressor (11,12; 31,32) be provided with check valve between refrigerant exit and the said oil eliminator (13,33).
10. a VRF Air Conditioning System is characterized in that, comprises according to each described oil piping system among the claim 1-9.
CN2011100440506A 2011-02-23 2011-02-23 Multiple connected air-conditioning unit and oil circuit system thereof CN102650479A (en)

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CN104121715A (en) * 2014-07-29 2014-10-29 浙江青风环境股份有限公司 Parallel sharing system vortex hydraulic filling type direct cooling unit special for surface treatment industry
CN107285426A (en) * 2016-04-11 2017-10-24 东莞百吉通信设备有限公司 One-to-many oil-water separation system
CN110296546A (en) * 2019-07-04 2019-10-01 宁波奥克斯电气股份有限公司 Method for controlling oil return, oil return control device and the air conditioner of multi-gang air-conditioner device
US10941955B2 (en) 2017-10-27 2021-03-09 Dometic Sweden Ab Systems, methods, and apparatuses for providing communications between climate control devices in a recreational vehicle

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Publication number Priority date Publication date Assignee Title
CN104121715A (en) * 2014-07-29 2014-10-29 浙江青风环境股份有限公司 Parallel sharing system vortex hydraulic filling type direct cooling unit special for surface treatment industry
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CN110296546A (en) * 2019-07-04 2019-10-01 宁波奥克斯电气股份有限公司 Method for controlling oil return, oil return control device and the air conditioner of multi-gang air-conditioner device
CN110296546B (en) * 2019-07-04 2020-06-30 宁波奥克斯电气股份有限公司 Oil return control method and oil return control device of multi-split air conditioner and air conditioner

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