CN105927522B - A kind of method for controlling oil return and its system of compressor governing system - Google Patents
A kind of method for controlling oil return and its system of compressor governing system Download PDFInfo
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- CN105927522B CN105927522B CN201610385884.6A CN201610385884A CN105927522B CN 105927522 B CN105927522 B CN 105927522B CN 201610385884 A CN201610385884 A CN 201610385884A CN 105927522 B CN105927522 B CN 105927522B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
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Abstract
The invention provides a kind of method for controlling oil return and its system of compressor governing system, by the tachometer value/frequency values for gathering very first time inner compressor；Judge whether tachometer value/frequency values of the compressor meet the first preparatory condition within the very first time, if meet, otherwise judge whether tachometer value/frequency values of the compressor meet the second preparatory condition within the very first time, if meet, then compressor is forced to operate for the second time with maximum (top) speed, so as to realize effective control to compressor governing system oil return, avoid because damage of the oil return deficiency to it, and method provided by the present invention and its system, only by the increase one-stage control logic in the controller of compressor governing system, and corresponding data acquisition module can be with realization, therefore it is easy to implement.
Description
Technical field
The present invention relates to refrigeration control technology, more particularly to a kind of method for controlling oil return of compressor governing system and
Its system.
Background technology
In the actual operation of data center module, the IT of computer room load be substantially in batches, restocking stage by stage, many computer rooms operations
Remain in for many years compared with being applied under low-load, the refrigerating capacity of air conditioner in machine room is superfluous for a long time；Compressor fall-back, reduce air-conditioning system
Cold is allowed to match with load, is one of energy saving means of computer room.
Compressor fall-back, refrigerant mass fluxes and pressure is caused to decline, gaseous coolant takes away the energy of lubricating oil
Power will drastically decline.Under the operating mode of high drop condenser pipe, compressor lubricant oil can not meet normal circulation, may cause to compress
Machine lubrication buildup can not normally return to compressor oil sump in blast pipe, the phenomenon of compressor oil sump lubricating oil deficiency be present.
In existing technology, after compressor fall-back, or do not account for the importance of oil return, exist compressor because
The risk that oil return is insufficient and damages；It is to increase bypass pipe on the suction tracheae of compressor from hardware, moistens compressor
Lubricating oil is able to return to oil sump, but the method cost is too high, and in old air-conditioning upgrade, is not easy to construct.
Therefore, prior art is improved up for further.
The content of the invention
In view of above-mentioned weak point of the prior art, it is an object of the invention to provide the user a kind of compressor speed governing
The method for controlling oil return and its system of system, overcome and compressor oil return is not controlled in the prior art, because of oil return deficiency, lead
Cause compressor damage, or use cost it is higher and be not easy to construct method for controlling oil return the defects of.
The technical proposal for solving the technical problem of the invention is as follows：
A kind of method for controlling oil return of compressor governing system, wherein, including：
A, tachometer value/frequency values of very first time inner compressor are gathered；
B, judge whether tachometer value/frequency values of the compressor meet the first preparatory condition within the very first time, if full
Foot, then step D is performed, otherwise perform step C；
C, judge whether tachometer value/frequency values of the compressor meet the second preparatory condition within the very first time, if full
Foot, then return to step A, otherwise performs step D；
D, compressor is forced to operate for the second time with maximum (top) speed.
The method for controlling oil return of the compressor governing system, wherein, including：
Include in the very first time：When the first timing time, the second timing time, the 3rd timing time, four timing
Between；
First timing time is when tachometer value/frequency values of the compressor are less than the time of the first predetermined threshold；
Second timing time is when tachometer value/frequency values of the compressor are in the first predetermined threshold and second pre-
Determine the time between threshold value；
3rd timing time is when tachometer value/frequency values of the compressor are in the second predetermined threshold and the 3rd pre-
Determine the time between threshold value；
4th timing time is when tachometer value/frequency values of the compressor are in the 3rd predetermined threshold and the 4th pre-
Determine the time between threshold value；
First preparatory condition is：When the first timing time, the second timing time, the 3rd timing time and four timing
Between after weighted calculation, calculation result data is less than predetermined number.
The method for controlling oil return of the compressor governing system, wherein, including：
Also include in the very first time：5th timing time；
5th timing time is when tachometer value/frequency values of the compressor are higher than the time of the 4th predetermined threshold；
Second preparatory condition is that the 5th timing time is more than predetermined timing time.
The method for controlling oil return of the compressor governing system, wherein, including：
First predetermined threshold is the data of 75% rated speed/rated frequency；
Second predetermined threshold is the data of 83% rated speed/rated frequency；
3rd predetermined threshold is the data of 90% rated speed/rated frequency；
4th predetermined threshold is the data of 95% rated speed/rated frequency.
The method for controlling oil return of the compressor governing system, wherein, the weighted calculation formula of first preparatory condition
For：
T=t1/30+t2/40+t3/50+t4/60；
Above-mentioned t1, t2, t3 and t4 are respectively the first timing time, the second timing time, the 3rd timing time and the 4th meter
When the time；T is the calculation result data of above-mentioned weighted calculation formula；
The predetermined number is 1；
The predetermined timing time is 3 minutes；
The scope of the very first time is：- 120 minutes 90 minutes；Second time is 3 minutes.
A kind of oil return control system of compressor governing system, wherein, including：
Data acquisition module, for gathering tachometer value/frequency values of very first time inner compressor；
First judge module, for judging whether tachometer value/frequency values of the compressor meet within the very first time
One preparatory condition；
Second judge module, for being preset when tachometer value/frequency values of the compressor in the very first time are unsatisfactory for first
During condition, judge whether tachometer value/frequency values of the compressor meet the second preparatory condition within the very first time；
Oil return module is controlled, for forcing compressor to operate default second time with maximum (top) speed.
The oil return control system of the compressor governing system, wherein, including：
Include in the very first time：When the first timing time, the second timing time, the 3rd timing time, four timing
Between；
First timing time is when tachometer value/frequency values of the compressor are less than the time of the first predetermined threshold；
Second timing time is when tachometer value/frequency values of the compressor are in the first predetermined threshold and second pre-
Determine the time between threshold value；
3rd timing time is when tachometer value/frequency values of the compressor are in the second predetermined threshold and the 3rd pre-
Determine the time between threshold value；
4th timing time is when tachometer value/frequency values of the compressor are in the 3rd predetermined threshold and the 4th pre-
Determine the time between threshold value；
First preparatory condition is：When the first timing time, the second timing time, the 3rd timing time and four timing
Between after weighted calculation, calculation result data is less than predetermined number.
The oil return control system of the compressor governing system, wherein, including：
Also include in the very first time：5th timing time；
5th timing time is when tachometer value/frequency values of the compressor are higher than the time of the 4th predetermined threshold；
Second preparatory condition is that the 5th timing time is more than predetermined timing time.
The oil return control system of the compressor governing system, wherein, including：
First predetermined threshold is the data of 75% rated speed/rated frequency；
Second predetermined threshold is the data of 83% rated speed/rated frequency；
3rd predetermined threshold is the data of 90% rated speed/rated frequency；
4th predetermined threshold is the data of 95% rated speed/rated frequency.
The oil return control system of the compressor governing system, wherein, including：
The weighted calculation formula of first preparatory condition is：
T=t1/30+t2/40+t3/50+t4/60；
Above-mentioned t1, t2, t3 and t4 are respectively the first timing time, the second timing time, the 3rd timing time and the 4th meter
When the time；T is the calculation result data of above-mentioned weighted calculation formula；
The predetermined number is 1；
The predetermined timing time is 3 minutes；
The scope of the very first time is：- 120 minutes 90 minutes；Default second time is 3 minutes.
Beneficial effect, the invention provides a kind of method for controlling oil return and its system of compressor governing system, by adopting
Collect tachometer value/frequency values of very first time inner compressor；Judge that tachometer value/frequency values of the compressor are within the very first time
The first preparatory condition of no satisfaction, if satisfied, otherwise judging whether tachometer value/frequency values of the compressor within the very first time are full
The second preparatory condition of foot, if satisfied, then forcing compressor to operate for the second time with maximum (top) speed, so as to realize to compressor speed governing
Effective control of system oil return, avoid because damage of the oil return deficiency to it, and method provided by the present invention and its be
System, only by the increase one-stage control logic in the controller of compressor governing system, and corresponding data acquisition module
Can be therefore easy to implement to realize.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the preferred embodiment of the method for controlling oil return of compressor governing system of the present invention；
Fig. 2 is the step flow chart of the method for the invention specific embodiment；
Fig. 3 is a kind of theory structure schematic diagram of the oil return control system of compressor governing system of the present invention.
Embodiment
To make the objects, technical solutions and advantages of the present invention clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and do not have to
It is of the invention in limiting.
The invention provides a kind of method for controlling oil return of compressor governing system, as shown in figure 1, methods described includes：
S1, the tachometer value/frequency values for gathering very first time inner compressor.
It is timed in this method first by timer, gathers the tachometer value or frequency of a period of time inner compressor
Value, is controlled according to the oil return of the tachometer value and frequency values to the compressor.
Specifically, for running status preferably different according to residing for compressor, corresponding oil return control is carried out, at this
In step, within the very first time, there is provided five different periods, it is respectively：First timing time, the second timing time,
3rd timing time, the 4th timing time and the 5th timing time.
First timing time is when tachometer value/frequency values of the compressor are less than the time of the first predetermined threshold；
Second timing time is when tachometer value/frequency values of the compressor are in the first predetermined threshold and second pre-
Determine the time between threshold value；
3rd timing time is when tachometer value/frequency values of the compressor are in the second predetermined threshold and the 3rd pre-
Determine the time between threshold value；
4th timing time is when tachometer value/frequency values of the compressor are in the 3rd predetermined threshold and the 4th pre-
Determine the time between threshold value；
First preparatory condition is：When the first timing time, the second timing time, the 3rd timing time and four timing
Between after weighted calculation, calculation result data is less than predetermined number.
5th timing time is when tachometer value/frequency values of the compressor are higher than the time of the 4th predetermined threshold；
Second preparatory condition is that the 5th timing time is more than predetermined timing time.
Preferably, first predetermined threshold is the data of 75% rated speed/rated frequency；Second predetermined threshold
For the data of 83% rated speed/rated frequency；3rd predetermined threshold is the data of 90% rated speed/rated frequency；Institute
State the data that the 4th predetermined threshold is 95% rated speed/rated frequency.
Start timer to collect compressor rotating speed or frequency residing for scope carry out corresponding timing, so as to adopt
Duration value corresponding to the rotating speed or frequency of the different range collected.
S2, judge whether tachometer value/frequency values of the compressor meet the first preparatory condition within the very first time, if full
Foot, then step S4 is performed, otherwise perform step S3.
This step, above-mentioned each timing time in the above-mentioned very first time is analyzed, judged in above-mentioned timing time
Whether first preparatory condition is met, the triggering control pressure oil return if meeting.
The weighted calculation formula of first preparatory condition is：
T=t1/30+t2/40+t3/50+t4/60；
Above-mentioned t1, t2, t3 and t4 are respectively the first timing time, the second timing time, the 3rd timing time and the 4th meter
When the time；T is the calculation result data of above-mentioned weighted calculation formula；
The predetermined number is 1；It that is to say and work as T >=1, if more than 1, meet the first preparatory condition, perform step S4, it is no
Then perform step S3.
S3, judge whether tachometer value/frequency values of the compressor meet the second preparatory condition within the very first time, if full
Foot, then return to step S1, otherwise performs step S4.
Second preparatory condition is whether the 5th timing time is more than predetermined timing time, if be more than predetermined timing
Between, then judge to meet the second preparatory condition, perform step S4, otherwise return to step S1, being defaulted as compressor need not be carried out by force
Row oil return controls.
Preferably, the predetermined timing time is 3 minutes；That is to say, when the compressor continue 3 minutes in rotating speed or
When person's frequency is more than the 95% of rated speed or frequency, then default compressor need not carry out forcing oil return control, otherwise perform
Step S4.
Preferably, the scope of the very first time is：- 120 minutes 90 minutes；It that is to say in step S1- steps S3, adopt
Collect the tachometer value or frequency values in the range of -120 minutes 90 minutes, and the tachometer value in the time or frequency values are sentenced
It is fixed, the scope corresponding to the timing time at it is judged respectively, and determines whether to trigger the first preparatory condition and second pre-
If condition, if triggering, step S4 is performed.
S4, compressor is forced to operate for the second time with maximum (top) speed.
If in above-mentioned steps, to the tachometer value in the first preset time either frequency values trigger the first preparatory condition or
Second preparatory condition, then in the state of controlling it compressor with rated speed or rated frequency, operation the 3rd is default
Time, it is preferred that default second time is 3 minutes.
Below exemplified by the specific embodiment of method described above, methods described is described further, as shown in Fig. 2 tool
Body embodiment comprises the following steps：
H1, by controller collect and process machine tachometer value N（Or frequency values f）,
H2, controller internal timer start the T1 that clocks, and unit is minute, in T1<During K, timing t1, t2, t3, t4 are accumulated,
T5, wherein：
t1:Tachometer value N<Rated speed × 75%（Or frequency values f<Rated frequency * 75%）Accumulated time value, unit
For minute；
t2:Rated speed × 75%≤tachometer value N<Rated speed * 83%（Or rated frequency 75%≤frequency values of * f
<Rated frequency * 83%）Accumulated time value, unit is minute；
t3:Rated speed × 83%<Tachometer value N≤rated speed * 90%（Or rated frequency 83%≤frequency values of * f
<Rated frequency * 90%）Accumulated time value, unit is minute；
t4:Rated speed × 90%<Tachometer value N≤rated speed * 95%（Or rated frequency 90%≤frequency values of * f
<Rated frequency * 95%）Accumulated time value, unit is minute；
t5:Tachometer value N>The continuous time value of rated speed × 95%, unit is minute；
H3, after obtaining described t1, t2, t3 and t4 time data in above-mentioned steps H2, T=t1/30+t2/ can be calculated
40+t3/50+t4/60 value, according to the T calculated value, judge T and 1 size, as T≤1, start oil return control, lead to
Controller output control signal is crossed, forces compressor to be operated with maximum (top) speed, i.e., rated speed operates, duration T2, complete
Zero is reset into rear all timer T1, t1, t2, t3, t4, t5, re-starts timing computing.
If H4, T are less than 1, t5 value is judged, as t5≤3, default compressor has completed oil return, now all timing
Device T1, t1, t2, t3, t4, t5 reset zero, re-start timing computing.
If H5, within the K times, the condition in above-mentioned steps H3 and H5 is unsatisfactory for, then as T1=K（According to operation of air conditioner work
Condition, the general values 90~120 of K）When, start oil return logic, by controller output control signal, force compressor to turn with maximum
Speed operating, duration T2, after the completion of all timer T1, t1, t2, t3, t4, t5 reset zero, re-start timing fortune
Calculate.
The invention provides a kind of compressor drop rotating speed operation after oil return control solution method, can make oil return operating mode with
Compressor actual motion frequency is combined, and is started compressor according to actual needs and is forced oil return control, reduces compressor rotary speed mutation
Caused by computer room temperature fluctuation increase harmful effect；Further safeguard procedures are have also been made in addition, in set time K,
If being not reaching to the oil return time, force start oil return logic.
Based on the above method, present invention also offers a kind of oil return control system of compressor governing system, such as
Shown in Fig. 3, the system includes：
Data acquisition module 110, for gathering tachometer value/frequency values of very first time inner compressor；
First judge module 120, for judging whether tachometer value/frequency values of the compressor meet within the very first time
First preparatory condition；
Second judge module 130, the tachometer value/frequency values are unsatisfactory for first for the compressor within the very first time are pre-
If during condition, judge whether tachometer value/frequency values of the compressor meet the second preparatory condition within the very first time；
Oil return module 140 is controlled, for forcing compressor to operate default second time with maximum (top) speed.
The oil return control system of the compressor governing system, wherein, including：
Include in the very first time：When the first timing time, the second timing time, the 3rd timing time, four timing
Between；
First timing time is when tachometer value/frequency values of the compressor are less than the time of the first predetermined threshold；
Second timing time is when tachometer value/frequency values of the compressor are in the first predetermined threshold and second pre-
Determine the time between threshold value；
3rd timing time is when tachometer value/frequency values of the compressor are in the second predetermined threshold and the 3rd pre-
Determine the time between threshold value；
4th timing time is when tachometer value/frequency values of the compressor are in the 3rd predetermined threshold and the 4th pre-
Determine the time between threshold value；
First preparatory condition is：When the first timing time, the second timing time, the 3rd timing time and four timing
Between after weighted calculation, calculation result data is less than predetermined number.
The oil return control system of the compressor governing system, wherein, including：
Also include in the very first time：5th timing time；
5th timing time is when tachometer value/frequency values of the compressor are higher than the time of the 4th predetermined threshold；
Second preparatory condition is that the 5th timing time is more than predetermined timing time.
The oil return control system of the compressor governing system, wherein, including：
First predetermined threshold is the data of 75% rated speed/rated frequency；
Second predetermined threshold is the data of 83% rated speed/rated frequency；
3rd predetermined threshold is the data of 90% rated speed/rated frequency；
4th predetermined threshold is the data of 95% rated speed/rated frequency.
The oil return control system of the compressor governing system, wherein, including：
The weighted calculation formula of first preparatory condition is：
T=t1/30+t2/40+t3/50+t4/60；
Above-mentioned t1, t2, t3 and t4 are respectively the first timing time, the second timing time, the 3rd timing time and the 4th meter
When the time；T is the calculation result data of above-mentioned weighted calculation formula；
The predetermined number is 1；
The predetermined timing time is 3 minutes；
The scope of the very first time is：- 120 minutes 90 minutes；Default second time is 3 minutes.
The invention provides a kind of method for controlling oil return and its system of compressor governing system, by gathering the very first time
Tachometer value/frequency values of inner compressor；Judge whether tachometer value/frequency values of the compressor meet first within the very first time
Preparatory condition, if satisfied, otherwise judging whether tachometer value/frequency values of the compressor meet that second is default within the very first time
Condition, if satisfied, then forcing compressor to operate for the second time with maximum (top) speed, so as to realize to compressor governing system oil return
Effectively control, avoid because of damage of the oil return deficiency to it, and method provided by the present invention and its system, only by
Increase one-stage control logic in the controller of compressor governing system, and corresponding data acquisition module can to realize,
Therefore it is easy to implement.
It is understood that for those of ordinary skills, can be with technique according to the invention scheme and its hair
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect scope.
Claims (6)
- A kind of 1. method for controlling oil return of compressor governing system, it is characterised in that including：A, tachometer value/frequency values of very first time inner compressor are gathered；B, judge whether tachometer value/frequency values of the compressor meet the first preparatory condition within the very first time, if satisfied, then Step D is performed, otherwise performs step C；C, judge whether tachometer value/frequency values of the compressor meet the second preparatory condition within the very first time, if satisfied, then Return to step A, otherwise perform step D；D, compressor is forced to operate for the second time with maximum (top) speed;Include in the very first time：First timing time, the second timing time, the 3rd timing time, the 4th timing time；First timing time is when tachometer value/frequency values of the compressor are less than the time of the first predetermined threshold；Second timing time is when tachometer value/frequency values of the compressor are in the first predetermined threshold and the second predetermined threshold Time between value；3rd timing time is when tachometer value/frequency values of the compressor are in the second predetermined threshold and the 3rd predetermined threshold Time between value；4th timing time is when tachometer value/frequency values of the compressor are in the 3rd predetermined threshold and the 4th predetermined threshold Time between value；First preparatory condition is：First timing time, the second timing time, the 3rd timing time and the 4th timing time add After power calculates, calculation result data is less than predetermined number；First predetermined threshold is the data of 75% rated speed/rated frequency；Second predetermined threshold is the data of 83% rated speed/rated frequency；3rd predetermined threshold is the data of 90% rated speed/rated frequency；4th predetermined threshold is the data of 95% rated speed/rated frequency.
- 2. the method for controlling oil return of compressor governing system according to claim 1, it is characterised in that including：Also include in the very first time：5th timing time；5th timing time is when tachometer value/frequency values of the compressor are higher than the time of the 4th predetermined threshold；Second preparatory condition is that the 5th timing time is more than predetermined timing time.
- 3. the method for controlling oil return of compressor governing system according to claim 2, it is characterised in that the described first default bar The weighted calculation formula of part is：T=t1/30+t2/40+t3/50+t4/60；When above-mentioned t1, t2, t3 and t4 are respectively the first timing time, the second timing time, the 3rd timing time and four timing Between；T is the calculation result data of above-mentioned weighted calculation formula；The predetermined number is 1；The predetermined timing time is 3 minutes；The scope of the very first time is：- 120 minutes 90 minutes；Second time is 3 minutes.
- A kind of 4. oil return control system of compressor governing system, it is characterised in that including：Data acquisition module, for gathering tachometer value/frequency values of very first time inner compressor；First judge module, for judging whether tachometer value/frequency values of the compressor meet that first is pre- within the very first time If condition；Second judge module, for being unsatisfactory for the first preparatory condition when tachometer value/frequency values of the compressor in the very first time When, judge whether tachometer value/frequency values of the compressor meet the second preparatory condition within the very first time；Oil return module is controlled, for forcing compressor to operate default second time with maximum (top) speed;Include in the very first time：First timing time, the second timing time, the 3rd timing time, the 4th timing time；First timing time is when tachometer value/frequency values of the compressor are less than the time of the first predetermined threshold；Second timing time is when tachometer value/frequency values of the compressor are in the first predetermined threshold and the second predetermined threshold Time between value；3rd timing time is when tachometer value/frequency values of the compressor are in the second predetermined threshold and the 3rd predetermined threshold Time between value；4th timing time is when tachometer value/frequency values of the compressor are in the 3rd predetermined threshold and the 4th predetermined threshold Time between value；First preparatory condition is：First timing time, the second timing time, the 3rd timing time and the 4th timing time add After power calculates, calculation result data is less than predetermined number；First predetermined threshold is the data of 75% rated speed/rated frequency；Second predetermined threshold is the data of 83% rated speed/rated frequency；3rd predetermined threshold is the data of 90% rated speed/rated frequency；4th predetermined threshold is the data of 95% rated speed/rated frequency.
- 5. the oil return control system of compressor governing system according to claim 4, it is characterised in that including：Also include in the very first time：5th timing time；5th timing time is when tachometer value/frequency values of the compressor are higher than the time of the 4th predetermined threshold；Second preparatory condition is that the 5th timing time is more than predetermined timing time.
- 6. the oil return control system of compressor governing system according to claim 5, it is characterised in that including：The weighted calculation formula of first preparatory condition is：T=t1/30+t2/40+t3/50+t4/60；When above-mentioned t1, t2, t3 and t4 are respectively the first timing time, the second timing time, the 3rd timing time and four timing Between；T is the calculation result data of above-mentioned weighted calculation formula；The predetermined number is 1；The predetermined timing time is 3 minutes；The scope of the very first time is：- 120 minutes 90 minutes；Default second time is 3 minutes.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005240637A (en) * | 2004-02-25 | 2005-09-08 | Mitsubishi Heavy Ind Ltd | Gas compression unit |
| JP5276514B2 (en) * | 2009-04-27 | 2013-08-28 | 三菱重工業株式会社 | Compressor |
| CN104006504B (en) * | 2014-06-19 | 2017-02-15 | 广东志高空调有限公司 | Variable frequency air conditioner low-frequency operating control method and control device |
| CN105509367A (en) * | 2014-09-26 | 2016-04-20 | 青岛海信日立空调***有限公司 | Oil return control method and device and outdoor unit of variable-frequency air conditioner |
| CN105588384B (en) * | 2014-12-10 | 2018-03-16 | 海信（山东）空调有限公司 | The method for controlling oil return and device of a kind of frequency converting air-conditioner compressor |
| CN104764167B (en) * | 2015-04-21 | 2018-05-01 | 珠海格力电器股份有限公司 | The method for controlling oil return of frequency converting air-conditioner compressor |
| CN104764168A (en) * | 2015-04-21 | 2015-07-08 | 广东志高空调有限公司 | Method and device for improving oil return efficiency of household variable frequency air conditioner after low-frequency running |
| CN105371531B (en) * | 2015-11-30 | 2018-02-09 | 珠海格力电器股份有限公司 | The low frequency method for controlling oil return and system of air conditioner |
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