CN106196789B - Control method for frequency, system and the air-conditioning of process are exited in a kind of air-conditioning defrost - Google Patents
Control method for frequency, system and the air-conditioning of process are exited in a kind of air-conditioning defrost Download PDFInfo
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- CN106196789B CN106196789B CN201610560586.6A CN201610560586A CN106196789B CN 106196789 B CN106196789 B CN 106196789B CN 201610560586 A CN201610560586 A CN 201610560586A CN 106196789 B CN106196789 B CN 106196789B
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- frequency
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- reducing rate
- stabilization time
- difference
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
-
- 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
- F25B2500/12—Sound
-
- 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
- F25B2600/021—Inverters therefor
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- 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 present invention relates to airconditioning control field, more particularly to control method for frequency, system and the air-conditioning of process are exited in a kind of air-conditioning defrost.Method includes the following steps：Acquisition meets current compressor running frequency when air-conditioning defrost exit criteria；Compare current compressor running frequency and preset shutdown frequency, frequency reducing rate and stabilization time are obtained according to comparison result；Control compressor according to the frequency reducing rate from current compressor running frequency be down to shut down frequency and to shut down stabilization time described in frequency continuous service after, it is out of service；After time out of service reaches preset dwell time, control compressor is run according to preset heating frequency.The present invention is when judgement needs to exit defrost process, suitable control method for frequency is selected according to current compressor running frequency, the refrigerant pressure of system is set fully to discharge in frequency control process, match tube vibration to reduce, avoid the danger for being piped disconnected pipe, reduce noise simultaneously, improve the air-conditioning experience sense of user by.
Description
Technical field
The present invention relates to convertible frequency air-conditioner control field, more particularly to the FREQUENCY CONTROL side of process is exited in a kind of air-conditioning defrost
Method, system and air-conditioning.
Background technology
In frequency-conversion air-conditioning system, when air conditioner heat-production is run, if frosting on outdoor condenser, it is easy to influence air-conditioning
The heat transfer effect of device, air conditioner need execution defrost process just to can guarantee heating effect.In the prior art, air conditioner commonization
Frost acts：First close compressor, four-way valve, outer wind turbine delay a period of time close, then a period of time compressor that is delayed is by
The heating frequency of setting is run, and when defrost has been completed in judgement, compressor is closed, and outer wind turbine is opened, and be delayed a period of time four-way
Valve is opened, then is delayed a period of time, and compressor is opened, and normal heat-production functions are restored.When exiting the defrost moment, compressor is logical
It is often to be run with upper frequency, direct close compressor, refrigerant pressure abrupt release at this time comes out, and causes piping vibration excessive,
Even there is the danger of the disconnected pipe of piping, while also will produce prodigious noise.
Invention content
The present invention provides control method for frequency, system and air-conditionings that process is exited in a kind of air-conditioning defrost, solve above
The technical problem.
The technical solution that the present invention solves above-mentioned technical problem is as follows：The FREQUENCY CONTROL side of process is exited in a kind of air-conditioning defrost
Method includes the following steps：
Step 1, current compressor running frequency when meeting air-conditioning defrost exit criteria is acquired；
Step 2, compare current compressor running frequency and preset shutdown frequency, frequency reducing rate is obtained according to comparison result
And stabilization time；
Step 3, control compressor according to the frequency reducing rate from current compressor running frequency be down to shut down frequency and with
It is out of service after shutting down stabilization time described in frequency continuous service；
Step 4, after the time out of service reaches preset dwell time, control compressor is transported according to preset heating frequency
Row.
The beneficial effects of the invention are as follows：The method of the present invention is when judgement needs to exit defrost process, according to current compression
The height of machine running frequency selects suitable frequency reducing rate and stabilization time, and the refrigerant pressure of frequency-conversion air-conditioning system is made fully to release
It puts, matches tube vibration to reduce, avoid the danger for being piped disconnected pipe, while reducing noise, improve the air-conditioning experience sense of user
By.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the step 2 is specially：
S201 determines current compressor running frequency and shuts down the difference of frequency；
S202, according to determining difference selection frequency reducing rate and the frequency reducing rate corresponding stabilization time.
Further, the S202 is specially：It pre-establishes current compressor running frequency and shuts down the difference and drop of frequency
Frequency rate, the related information table of stabilization time obtain the mathematic interpolation result in difference by inquiring the related information table
Stabilization time under frequency reducing rate.
Advantageous effect using above-mentioned further scheme is：The further technical solution of the present invention is by presetting related information
Table can quickly find stabilization time of the difference under different frequency reducing rates, to be accurately controlled according to actual conditions
Compressor exits the process before defrost, discharges refrigerant pressure to the greatest extent, and the time before defrost is exited in shortening.
Further, in the related information table, when current compressor running frequency is identical as the difference of frequency is shut down, frequency reducing
Rate is bigger, and the stabilization time is longer；When frequency reducing rate is identical, current compressor running frequency and the difference for shutting down frequency
Bigger, the stabilization time is longer.
Further, in the related information table, current compressor running frequency and the difference for shutting down frequency are smaller, and frequency reducing
Rate is smaller, and stabilization time more levels off to 0.
Further, the value range of the frequency reducing rate is 1~5Hz/s.
Further, it is downconverted to from compressor starts and the total time that the stabilization time terminates is less than 45s.
Further, it is downconverted to from compressor starts and the total time that the stabilization time terminates is less than 35s.
Advantageous effect using above-mentioned further scheme is：In this further scheme, when by frequency reducing rate with stablizing
Between controlled, to control compressor starts be downconverted to compressor according to heating frequency operation time, so that air-conditioning is changed as early as possible
Frost avoids the time for increasing entire defrost process, influences heating effect.
Further, when current compressor running frequency with shut down frequency difference be 50~60Hz, and frequency reducing rate be 1~
When 2Hz/s, stabilization time is 1~2s；When current compressor running frequency and the difference of frequency is shut down as 50~60Hz, and frequency reducing
When rate is 3~5Hz/s, stabilization time is 4~10s.
Further, when current compressor running frequency with shut down frequency difference be 60~70Hz, and frequency reducing rate be 3~
When 5Hz/s, stabilization time is 10~15s；When current compressor running frequency and the difference of frequency is shut down as 10~20Hz, and is dropped
When frequency rate is 1~2Hz/s, stabilization time 0s.
In order to solve the technical problem, the present invention also provides the FREQUENCY CONTROL systems that process is exited in a kind of air-conditioning defrost
System, including acquisition module, comparison module and control module,
The acquisition module is used to acquire current compressor running frequency when meeting air-conditioning defrost exit criteria；
The comparison module is obtained for comparing current compressor running frequency and preset shutdown frequency according to comparison result
Take frequency reducing rate and stabilization time；
The control module is stopped for controlling compressor and being down to from current compressor running frequency according to the frequency reducing rate
Unit frequency and to shut down stabilization time described in frequency continuous service after, it is out of service；And the time out of service reaches preset and stops
Only after the time, control compressor is run according to preset heating frequency.
Further, the comparison module includes：
Computing unit, for determining current compressor running frequency and shutting down the difference of frequency；
Selecting unit, for corresponding steady according to determining difference selection frequency reducing rate and the frequency reducing rate
It fixes time.
Further, the comparison module further includes that related information table establishes unit, and the related information table establishes unit use
In the difference and frequency reducing rate, the related information table of stabilization time that pre-establish current compressor running frequency with shut down frequency；
The selecting unit obtains stabilization time of the difference under different frequency reducing rates by inquiring the related information table.
In order to solve the technical problem, the present invention also provides a kind of air-conditionings, including the air-conditioning defrost to exit
The frequency control system of journey.
Description of the drawings
Fig. 1 is the flow diagram for the control method for frequency that process is exited in 1 air-conditioning defrost of embodiment；
Fig. 2 is the structural schematic diagram for the frequency control system that process is exited in 2 air-conditioning defrost of embodiment；
Fig. 3 is a kind of structural schematic diagram of 3 air-conditioning of embodiment.
Specific implementation mode
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in Figure 1, the flow diagram of the control method for frequency of process is exited for air-conditioning defrost of the present invention, including it is following
Step：
Step 1, current compressor running frequency when meeting air-conditioning defrost exit criteria is acquired；
Step 2, compare current compressor running frequency and preset shutdown frequency, frequency reducing rate is obtained according to comparison result
And stabilization time；
Step 3, control compressor according to the frequency reducing rate from current compressor running frequency be down to shut down frequency and with
It is out of service after shutting down stabilization time described in frequency continuous service；
Step 4, after the time out of service reaches preset dwell time, control compressor is transported according to preset heating frequency
Row.
The method of the present embodiment compares current compressor running frequency and preset when judgement needs to exit defrost process
Shut down frequency.If current compressor running frequency is less than or equal to preset shutdown frequency, control compressor directly stops
Operation, and after preset dwell time, control compressor is run according to preset heating frequency.If current compressor operation frequency
When rate is more than preset shutdown frequency, when selecting suitable frequency reducing rate according to the height of current compressor running frequency and stablize
Between, so that the refrigerant pressure of frequency-conversion air-conditioning system is fully discharged, matches tube vibration to reduce, avoid the danger for being piped disconnected pipe, simultaneously
Reduce noise, improve the air-conditioning experience sense of user by.
In the present embodiment, the step 2 is specially：
S201 determines current compressor running frequency and shuts down the difference of frequency；
S202 pre-establishes current compressor running frequency and shuts down difference and the frequency reducing rate of frequency, stabilization time
Related information table obtains stabilization of the mathematic interpolation result under different frequency reducing rates by inquiring the related information table
Time.
In the related information table in the present invention, when current compressor running frequency is identical as the difference of frequency is shut down,
Frequency reducing rate is bigger, and the stabilization time is longer；When frequency reducing rate is identical, current compressor running frequency and shutdown frequency
Difference is bigger, and the stabilization time is longer.Current compressor running frequency and the difference for shutting down frequency are smaller, and frequency reducing rate is got over
Small, stabilization time more levels off to 0.Meanwhile the value range of the frequency reducing rate is 1~5Hz/s；It is downconverted to from compressor starts
The total time that the stabilization time terminates is less than 45s, preferably less than 35s.
In the present embodiment, if compressor current operation frequency is 84Hz, as 30Hz, frequency reducing rate is the shutdown frequency set
2Hz/s, stabilization time 2s, then the frequency reducing time be：(84Hz-30Hz)/(2Hz/s)=27s, total time are 27s+2s=
29s。
If compressor current operation frequency is 84Hz, for the shutdown frequency set as 30Hz, frequency reducing rate is 3Hz/s, is stablized
Time is 5s, then the frequency reducing time is (84Hz-30Hz)/(3Hz/s)=18s, and total time is 18s+5s=23s.
If compressor current operation frequency is 99Hz, for the shutdown frequency set as 30Hz, frequency reducing rate is 3Hz/s, is stablized
Time is 10s, then the frequency reducing time is (99Hz-30Hz)/(3Hz/s)=23s, and total time is 23s+10s=33s.
If compressor current operation frequency is 50Hz, for the shutdown frequency set as 30Hz, frequency reducing rate is 2Hz/s, is stablized
Time is 0s, then the frequency reducing time is (50Hz-30Hz)/(2Hz/s)=10s, and total time is 10s+0s=10s.
In other preferred embodiments, when current compressor running frequency and the difference of frequency is shut down as 50~60Hz, and
When frequency reducing rate is 1~2Hz/s, stabilization time is 1~2s；When current compressor running frequency is 50 with the difference for shutting down frequency
~60Hz, and frequency reducing rate be 3~5Hz/s when, stabilization time be 4~8s.When current compressor running frequency and shutdown frequency
Difference be 60~70Hz, and frequency reducing rate be 3~5Hz/s when, stabilization time be 8~15s；When current compressor running frequency
With shut down frequency difference be 10~20Hz, and frequency reducing rate be 1~2Hz/s when, stabilization time 0s.
As shown in Fig. 2, exiting the structural schematic diagram of the frequency control system of process for 2 air-conditioning defrost of embodiment, including adopt
Collect module, comparison module and control module,
The acquisition module is used to acquire current compressor running frequency when meeting air-conditioning defrost exit criteria；
The comparison module is obtained for comparing current compressor running frequency and preset shutdown frequency according to comparison result
Take frequency reducing rate and stabilization time；
The control module is stopped for controlling compressor and being down to from current compressor running frequency according to the frequency reducing rate
Unit frequency and to shut down stabilization time described in frequency continuous service after, it is out of service；And the time out of service reaches preset and stops
Only after the time, control compressor is run according to preset heating frequency.
In the present embodiment, the comparison module includes：
Computing unit, for calculating current compressor running frequency and shutting down the difference of frequency；
Related information table establishes unit, difference and drop for pre-establishing current compressor running frequency with shutting down frequency
Frequency rate, the related information table of stabilization time；The selecting unit obtains the difference and exists by inquiring the related information table
Stabilization time under different frequency reducing rates；
Selecting unit, for selecting frequency reducing rate and the frequency reducing rate corresponding stabilization time according to difference.
As shown in figure 3, for a kind of structural schematic diagram of 3 air-conditioning of embodiment, including above-described air-conditioning defrost was exited
The frequency control system of journey.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indicating or implies relative importance or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (13)
1. the control method for frequency of process is exited in a kind of air-conditioning defrost, which is characterized in that include the following steps：
Step 1, current compressor running frequency when meeting air-conditioning defrost exit criteria is acquired；
Step 2, compare current compressor running frequency and preset shutdown frequency, according to comparison result acquisition frequency reducing rate and surely
It fixes time；
Step 3, control compressor is down to from current compressor running frequency according to the frequency reducing rate and shuts down frequency and to shut down
It is out of service after stabilization time described in frequency continuous service；
Step 4, after the time out of service reaches preset dwell time, control compressor is run according to preset heating frequency.
2. the control method for frequency of process is exited in air-conditioning defrost according to claim 1, which is characterized in that the step 2
Specially：
S201 determines current compressor running frequency and shuts down the difference of frequency；
S202, according to determining difference selection frequency reducing rate and the frequency reducing rate corresponding stabilization time.
3. the control method for frequency of process is exited in air-conditioning defrost according to claim 2, which is characterized in that the S202 tools
Body is：It pre-establishes current compressor running frequency and shuts down the difference and frequency reducing rate, the related information of stabilization time of frequency
Table obtains stabilization time of the difference under different frequency reducing rates by inquiring the related information table.
4. the control method for frequency of process is exited in air-conditioning defrost according to claim 3, which is characterized in that the association letter
It ceases in table, when current compressor running frequency is identical as the difference of frequency is shut down, frequency reducing rate is bigger, and the stabilization time gets over
It is long；When frequency reducing rate is identical, current compressor running frequency is bigger with the difference for shutting down frequency, and the stabilization time is longer.
5. the control method for frequency of process is exited in air-conditioning defrost according to claim 3, which is characterized in that the association letter
It ceases in table, current compressor running frequency and the difference for shutting down frequency are smaller, and frequency reducing rate is smaller, and stabilization time more levels off to
0。
6. exiting the control method for frequency of process according to any air-conditioning defrost of Claims 1 to 5, which is characterized in that from
Compressor starts, which are downconverted to, the total time that the stabilization time terminates is less than 45s.
7. the control method for frequency of process is exited in air-conditioning defrost according to claim 6, which is characterized in that opened from compressor
Begin to be downconverted to and the total time that the stabilization time terminates is less than 35s.
8. the control method for frequency of process is exited in air-conditioning defrost according to claim 7, which is characterized in that work as current compression
Machine running frequency with shut down frequency difference be 50~60Hz, and frequency reducing rate be 1~2Hz/s when, stabilization time be 1~2s；
When current compressor running frequency is 50~60Hz with the difference for shutting down frequency, and frequency reducing rate is 3~5Hz/s, when stablizing
Between be 4~8s.
9. the control method for frequency of process is exited in air-conditioning defrost according to claim 7, which is characterized in that work as current compression
Machine running frequency with shut down frequency difference be 60~70Hz, and frequency reducing rate be 3~5Hz/s when, stabilization time be 8~15s；
When current compressor running frequency is 10~20Hz with the difference for shutting down frequency, and frequency reducing rate is 1~2Hz/s, when stablizing
Between be 0s.
10. the frequency control system of process is exited in a kind of air-conditioning defrost, which is characterized in that including acquisition module, comparison module and
Control module,
The acquisition module is used to acquire current compressor running frequency when meeting air-conditioning defrost exit criteria；
The comparison module is obtained according to comparison result and is dropped for comparing current compressor running frequency and preset shutdown frequency
Frequency rate and stabilization time；
The control module is down to shutdown frequency according to the frequency reducing rate for controlling compressor from current compressor running frequency
Rate and to shut down stabilization time described in frequency continuous service after, it is out of service；And the time out of service is when reaching preset stopping
Between after, control compressor run according to preset heating frequency.
11. the frequency control system of process is exited in air-conditioning defrost according to claim 10, which is characterized in that the comparison
Module includes：
Computing unit, for determining current compressor running frequency and shutting down the difference of frequency；
Selecting unit, for selecting frequency reducing rate and the frequency reducing rate corresponding stabilization time according to the difference.
12. the frequency control system of process is exited in air-conditioning defrost according to claim 11, which is characterized in that the comparison
Module further includes that related information table establishes unit, and the related information table establishes unit for pre-establishing current compressor operation
Frequency and the difference and frequency reducing rate, the related information table of stabilization time for shutting down frequency；The selecting unit passes through described in inquiry
Related information table obtains stabilization time of the difference under different frequency reducing rates.
13. a kind of air-conditioning, it is characterised in that exit the frequency of process including any air-conditioning defrost of claim 10~12
Control system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610560586.6A CN106196789B (en) | 2016-07-13 | 2016-07-13 | Control method for frequency, system and the air-conditioning of process are exited in a kind of air-conditioning defrost |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610560586.6A CN106196789B (en) | 2016-07-13 | 2016-07-13 | Control method for frequency, system and the air-conditioning of process are exited in a kind of air-conditioning defrost |
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| CN106196789B true CN106196789B (en) | 2018-07-17 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108758972B (en) * | 2018-05-16 | 2020-12-22 | 广东美的制冷设备有限公司 | Air conditioner heating and defrosting control method, air conditioner and storage medium |
| CN111023459B (en) * | 2019-12-30 | 2021-06-15 | 宁波奥克斯电气股份有限公司 | Air conditioner operation control method and device and air conditioner |
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| US5285646A (en) * | 1990-06-01 | 1994-02-15 | Samsung Electronics Co., Ltd. | Method for reversing a compressor in a heat pump |
| CN101187516A (en) * | 2006-11-17 | 2008-05-28 | 海尔集团公司 | Air-conditioner defrosting method |
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| CN104296434A (en) * | 2014-10-29 | 2015-01-21 | 珠海格力电器股份有限公司 | Defrosting control method and system of air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6113503B2 (en) * | 2012-12-28 | 2017-04-12 | ダイキン工業株式会社 | Heat pump equipment |
| JP5590195B1 (en) * | 2013-07-11 | 2014-09-17 | 株式会社富士通ゼネラル | Air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5285646A (en) * | 1990-06-01 | 1994-02-15 | Samsung Electronics Co., Ltd. | Method for reversing a compressor in a heat pump |
| CN101187516A (en) * | 2006-11-17 | 2008-05-28 | 海尔集团公司 | Air-conditioner defrosting method |
| CN101968248A (en) * | 2010-08-26 | 2011-02-09 | 宁波奥克斯电气有限公司 | Control method for oil return of DC inverter compressor |
| CN103123194A (en) * | 2012-03-31 | 2013-05-29 | 宁波奥克斯电气有限公司 | Defrosting method of multi-combination type air conditioning unit |
| CN103940038A (en) * | 2014-04-03 | 2014-07-23 | 广东美的集团芜湖制冷设备有限公司 | Defrosting control method of air conditioner |
| CN104296434A (en) * | 2014-10-29 | 2015-01-21 | 珠海格力电器股份有限公司 | Defrosting control method and system of air conditioner |
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| CN106196789A (en) | 2016-12-07 |
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